High-sensitivity pressure switch

The utility model discloses a high-sensitivity pressure switch, which comprises a support, a base and a shell, an internal threaded hole, a rubber gasket hole, a water through hole and a water inlet hole are sequentially formed in the center of the base from the top surface to the bottom surface, a first step surface is formed between the internal threaded hole and the rubber gasket hole, and a second step surface is formed between the rubber gasket hole and the water through hole; the rubber gasket is arranged in the rubber gasket hole; the rubber gasket comprises a middle film and an annularrib which is arranged at the periphery of the middle film and has an O-shaped section; the annular rib is located on the second step face, the height of the annular rib is larger than the thickness of the middle film, meanwhile, the height of the annular rib is larger than the distance between the first step face and the second step face, and the thickness of the middle film is smaller than or equal to the distance betwe