Cylinder valve device

The utility model discloses a cylinder valve device which comprises a cylinder barrel, a piston, a piston rod and a diaphragm, wherein the internal of the cylinder barrel comprises a cavity and a pipeline, the diaphragm is arranged in the cylinder barrel between the cavity and a pipeline, the cavity is provided with a first air hole and a second air hole, the piston is arranged in the cavity between the first air hole and the second air hole and is connected with the piston rod, the diaphragm is provided with a guide hole, and the piston rod is connected to the pipeline through the guide hole. According to the cylinder valve device disclosed by the utility model, by arranging the first air hole and the second air hole which are connected with an external air compressor in the cylinder barrel, air pressures of an upper cavity and a lower cavity vary by utilizing the air compressor, so that the piston moves up and down, and the piston rod is driven by the piston to block or conduct the pipeline and control the circulation of the liquid in the pipeline.