The so-called hydraulic elevator refers to the equipment that realizes lifting through the pressure transmission of hydraulic oil, which is not only reliable in quality, but also perfect in performance. It is a kind of hoisting machinery equipment mainly composed of walking mechanism, hydraulic mechanism, electric control mechanism and supporting mechanism. Generally, it can be scissors type, crank arm type, cylinder sleeve type and aluminum alloy type, and the lifting height ranges from 4 meters to 38 meters. Now it is widely used in plant maintenance, municipal construction, hotel decoration and so on.