A chain ditcher relates to a ditching equipment device, in particular to a chain ditcher for laying farmland pipelines, urban and rural optical cables and the like. A new type of ditching equipment specially designed for 20-95 horsepower tractors is developed and designed according to customer's needs. It realizes low-speed crawling by installing an ultra-low-speed transmission on an ordinary tractor, so that the depth of the ditch is unified up and down and the width is symmetrical left and right. This machine adopts rotary ditcher, with ditching width of 10-40cm and adjustable ditching depth, with the maximum ditching depth of 160cm and ditching speed of 100-300m per hour. The trench shape is straight and steep, and the depth and width of the trench are uniform, so it is impossible for manual and excavator to open this trench shape. It is mainly suitable for ditching underground pipelines, water pipelines and underground cables in farmland irrigation areas. Matching tractor power 25-95 horsepower working speed 50-500 m/h cylinder pressure 16Mpa ditching width 15, 20, 25, 30, 35, 40cm ditching depth 0-0-160cm. (Note: Ditching width is greater than 40cm, which can be customized! The price will be determined separately. ) remarkable economic benefits: buying this machine requires less investment and quick results. A machine can replace the work of dozens of people, without worrying about some chores such as food and shelter for workers; Good ditching quality: the narrowest ditching can reach 10-40 cm, and the deepest ditching can reach 1.5 m, and the ditching is straight and steep, so it is impossible for manual and excavator to dig such a ditch. Good quality and long service life: the blade and chain are made of special materials and technology, with long service life; High efficiency: Compared with manual and excavator, it has higher working efficiency (3-5 times that of excavator and higher self-propelled efficiency) and economic benefits, especially in the case of digging narrow and deep trenches (buried pipes or cables), the working effect of this machine is more prominent. The whole machine has simple structure, convenient operation and easy maintenance. If the supporting tractor does not have ultra-low gear (crawling gear), our unit can transform it and install ultra-low gear. Excavators, also known as digging machines, are earth-moving machines that use buckets to dig materials above or below the bearing surface, load them into transport vehicles or unload them into the yard. The materials excavated by excavators are mainly soil, coal, sediments and pre-loosened soil and rocks. Judging from the development of construction machinery in recent years, excavators have developed relatively rapidly, and excavators have become one of the most important construction machinery in engineering construction. The three most important parameters of excavator are working weight (mass), engine power and bucket capacity. Common excavator structures include power device, working device, slewing mechanism, control mechanism, transmission mechanism, walking mechanism and auxiliary facilities. From the appearance, the excavator consists of three parts: working device, upper turntable and walking mechanism. According to its structure and use, it can be divided into crawler type, tire type, walking type, full hydraulic type, semi-hydraulic type, full rotary type, non-full rotary type, universal type, special type, articulated type and telescopic arm type. The working device is a device that directly completes the excavation task. It consists of boom, bucket and bucket. The lifting and lowering of the boom, the extension of the boom and the rotation of the bucket are all controlled by reciprocating double-acting hydraulic cylinders. In order to meet the needs of different construction operations, excavators can be equipped with a variety of working devices, such as digging, lifting, loading, leveling, clamping, bulldozing, impact hammer and other working tools. The rotary walking device is the body of the hydraulic excavator, and the upper part of the turntable is provided with a power device and a transmission system. Engine is the power source of excavator, so diesel oil can be used in convenient places, or motor can be used instead. The transmission mechanism transmits the power of the engine to the hydraulic motor, hydraulic cylinder and other executive elements through the hydraulic pump, and pushes the working device to move, thus completing various operations.