Gearbox housing cleaning device and cleaning method

The invention discloses a gearbox housing cleaning device and cleaning method. The gearbox housing cleaning device comprises a conveying mechanism, and a cleaning mechanism arranged on one side of theconveying mechanism, wherein the conveying mechanism comprises a first conveying device, a second conveying device, a right connecting device and a left connecting device; the first conveying devicecomprises a first right conveying part, a first middle conveying part, a first left conveying part and a pushing part; the pushing part comprises a first rack; a first conveying roller is arranged onthe top part of the first rack; a lifting plate is arranged under the first conveying roller; first guide wheel assemblies are arranged on two sides of the upper surface of the lifting plate; a firstlifting air cylinder is arranged in the middle of the lower surface of the lifting plate; adjustable support pieces are arranged on two sides of the first lifting air cylinder; a first pushing air cylinder is arranged between th