Anti-blocking spray gun for secondary spraying of valve

The anti-blocking spray gun comprises a spray gun body and a spray head arranged on the spray gun body, and an anti-blocking mechanism is arranged on the side, away from the spray gun body, of the spray head. The anti-blocking mechanism comprises a first fixing block, a first hinge rod and a protection plate, the first fixing block is fixed to the outer wall of the top of the spray head, one end of the first hinge rod is rotationally connected to the outer wall of the first fixing block, the protection plate is fixed to the other end of the first hinge rod, and the protection plate corresponds to the spray head. According to the anti-blocking spray gun for secondary spraying of the valve, by arranging the anti-blocking mechanism, a threaded rod can be rotated to drive a push plate, a second hinge rod, a connecting plate and a first hinge rod to rotate, so that a protective plate is driven to open or close a discharging opening in a spray head, the mode is easy and convenient to operate, the position of the pr