According to the structure characteristics of the spray cleaning cylinder, take the painting cylinder as experimental object and analyze the main causes of contamination of oil cylinders before painting. Starting from the working principle of cleaning machine equipment, find out the unreasonable structure design of the spray cleaning cylinder when the original equipment cleans the cylinder workpiece. As a result, the surface of the cylinder workpiece is not cleaned thoroughly, and the drying can not be carried out in time after spray cleaning. By improving the structure of the inner and outer parts of the spray cleaning cylinder of the cleaning machine, and rationally optimizing the relevant parameters of the spray cleaning cylinder. The problems mentioned above can be solved, then the cleaning quality and efficiency of the painting cylinder can be significantly improved.