Main pipe pressure sensor of water supply system

The utility model relates to the technical field of water supply systems, and discloses a header pipe pressure sensor of a water supply system, which comprises a water supply pipeline, the circumferential surface of the water supply pipeline is fixedly connected with a mounting pipe communicated with the inside of the water supply pipeline, and a piston block capable of moving up and down is inserted in the mounting pipe. And an elastic piece used for pushing the piston block to move towards the water supply pipeline is arranged in the mounting pipe, the top of the mounting pipe is fixedly connected with a hollow rectangular block, a stroke groove is formed in the front face of the rectangular block in the height direction of the rectangular block, and a pointing rod capable of moving up and down synchronously with the piston block is inserted into the stroke groove. According to the utility model, through the arrangement of the piston block and the pointing rod, when water is in the water supply pipeline, th