Emulsified diesel oil (micro-emulsified diesel oil) is a water-in-oil (W/O) type (transparent) emulsion formed by emulsifying water (or methanol) and diesel oil with emulsifier and co-emulsifier in certain emulsifying equipment. Micro-emulsified diesel oil is visually transparent, while emulsified oil is opaque. The particle size of emulsified oil is about 0. 1~ 10 micron; The amount of emulsifier in microemulsion is much larger than that in emulsification; The stability of micro-emulsified oil is better than emulsified oil.