Control switch for spray gun

The invention belongs to the technical field of coating, and particularly relates to a control switch for a spray gun. The spray gun comprises a liquid inlet pipe and a spray head, the control switch device comprises a handrail block arranged between the liquid inlet pipe and the spray head, and a sliding groove is formed in the handrail block; one end of the valve core unit is connected with the liquid inlet pipe, and the other end of the valve core unit is connected with the nozzle; the pushing column unit is installed in the sliding groove and used for switching the water way cut-off state or the water way conduction state of the valve element unit and adjusting the flow in the water way conduction state; the gear set is used for connecting the pushing column unit and the valve element unit; and the locking column unit is arranged on the pushing column unit and is used for locking or unlocking the pushing column unit. The push column capable of controlling the valve element is arranged on the handrail bloc