Heat preservation breathing well lid for air valve and using method

The invention belongs to the technical field of municipal engineering, and particularly discloses a heat preservation breathing well lid for an air valve and a using method. The well lid is provided with a plurality of first vent holes, a cylindrical supporting structure is arranged below the well lid, a cavity is formed inside the supporting structure, a cylindrical inner cylinder is arranged in the supporting structure, a plurality of second vent holes are formed in the cylinder wall of the inner cylinder, a bottom plate is arranged at the bottom of the inner cylinder, a column body is arranged in the center of the bottom plate, a plurality of third vent holes are formed in the bottom plate, an annular baffle is arranged above the third vent holes, an upper plate is arranged on the column body, a middle partition plate is arranged between the upper plate and the bottom plate, a plurality of fourth vent holes are formed in the middle partition plate, and a spring is arranged on the column body between the middle partition plate and the upper plate. According to the heat preservation breathing well lid for the air valve and the using method, the upper plate, the column body, the bottom plate and an annular cover plate can move up and down along with the change of the pressure in a valve well to meet the exhaust and air suction requirements of the air valve, and production accidents caused by the slow exhaust or air suction process are avoided.