The present invention relates to a cap cleaning device for an automobile paint gun. In the related art, when a coating paint is changed, the cap of the paint gun is not cleaned, and thus, a specific color, which is buried in the cap of the gun, is mixed with the next color and becomes discolored. The present invention has been a problem that the separation or regeneration is not possible because the waste thinner and the waste paint just discarded in the coagulant, the present invention is connected to the upper compartment 100 and the lower compartment 200 by the spring 300 and the upper compartment ( In the 100, the insertion hole 110 for cleaning and the insertion hole 120 are formed. The stopper 130 is installed at one side and the other side of the upper end, and the thinner nozzle 210 and the air nozzle in the lower compartment 200. And install a 220, and at the lower end of the lower compartment 200, the paint container and the waste paint are collected to form a receiving tube 400 and a connection pipe 410 through which this flows and can be moved to a waste liquid collection device. Gun (500) ) To be inserted into the cleaning insertion hole 110 and the withdrawal insertion hole 120 of the upper compartment 100 to clean the cap 510 of the gun 500 so as to change the color of the coating gun 500. Discoloration of the changed color due to the previous color on the cap 510 of the gun 500 can be easily solved, waste thinner and waste paint is a useful invention that can be reused after moving to the waste liquid recovery device.
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