Automatic cleaning device for paint sprayer gun

An automatic cleaning device for paint sprayer gun comprises a cleaning tank (1) and a solvent container (2), a solvent injection pipe (11) provided with at least one nozzle (12) is installed in the cleaning tank (1). A solvent drain pipe (3) is disposed between the cleaning tank (1) and the solvent container (2) for communicating this two component parts. A solvent supply pipe (4) is inserted into the cleaning tank (1) and its one end is communicating with the injection pipe (11), while the other end is extended to the bottom of the solvent container (2). When the pressurized air supplied from an air compressor enters the solvent container via an entry inlet provided on the top of the solvent container (2), the solvent is forced into the injection pipe (11) via the solvent supply pipe (4) and injected out of the nozzle (12) for performing cleaning work. The used solvent flows back to the solvent container (2) by way of the solvent drain pipe (3) for repeated use. No fear of occurrence of hazardous electrostatic induction accident shall be considered because there is no mechanical friction in any part of the device so that the perfect safety can be expected.