A telescopic spray gun is a spraying device that can automatically adjust the nozzle length. It is often used in spraying operations and can adapt to the spraying needs of different workpieces. The characteristics of the telescopic spray gun include the use of an air-assisted dual-fluid structure, the gun body and the nozzle are threaded, and the nozzle does not need to be replaced together with the gun body when it is replaced; the nozzle is protected by a silicon carbide protective sleeve or a wear-resistant alloy spray protective sleeve, and the spray gun uses tail atomization technology, three-stage atomization, and finer atomization.