Air compressor capable of automatically converting frequency according to negative pressure

The utility model belongs to the technical field of air compressors, in particular to an air compressor capable of automatically converting frequency according to negative pressure, which comprises a water tank, a semiconductor chilling plate is embedded at the bottom of the inner wall of the water tank, four corners of the top of the water tank are fixedly connected with support rods, and the tops of the four support rods are fixedly connected with a hollow plate. An air compressor body is fixedly connected to one side of the top of the hollowed-out plate through a supporting plate, a bent pipe is fixedly connected to the outer side of the air compressor body, a water pump is fixedly connected to the top of the water tank, the water inlet end of the water pump communicates with a water pumping pipe, and one end of the water pumping pipe penetrates through the water tank to be located in the water tank. Through the combined action of a semiconductor chilling plate, a water pump and a bent pipe, the heat dissi