Spray gun facilitating liquid adding

The invention relates to the technical field of spray guns, and discloses a spray gun convenient to add liquid, which comprises a spray gun body and a spray gun air source valve mounted on the inner side of the spray gun body, the spray gun body comprises a spray gun body and a spray gun handle mounted on the lower side of the spray gun body, an atomizing nozzle is mounted at the front end of the spray gun body, and a liquid adding interface is mounted on the upper side of the spray gun body. A spraying cavity is connected to the inner side of the atomizing nozzle, a gas guide connector is installed at the bottom of the spray gun handle, a first gas cavity communicated with the gas guide connector is formed in the spray gun handle, a second gas cavity connected with the first gas cavity is formed in the spray gun body, and a premixed oil gas guide channel and a premixed liquid gas guide channel are connected between the second gas cavity and the spraying cavity in parallel. The premixed ...