Pneumatic type heavy liquid spraying device

The invention relates to a pneumatic type heavy liquid spraying device, and belongs to the technical field of spraying. The spraying device comprises a gas storage device, a liquid storage device, a gun body and a control system; a gas outlet of the gas storage device is connected with a gas inlet of the liquid storage device through a pipeline provided with a pressure reducing valve and a one-way valve, and the gas storage device is used for inputting gas with set pressure into the liquid storage device; the liquid storage device is provided with a pressure sensor and a pressure release valve; one end of a gun barrel in the gun body is connected with an opening of the liquid storage device through a pipeline, and the other end of the gun barrel is connected with an air cylinder opening valve; the gun body front bracket and the gun body rear bracket are used for supporting the gun body; a liquid spraying valve in the air cylinder opening valve is connected with a liquid spraying pipe of the spraying nozzle; t