Pressure tank

The utility model discloses a pressure tank. The pressure tank comprises a tank body and a sealing head, the tank body is connected with the sealing head through bolts, a handle and a spiral drum are arranged at the top of the sealing head, a regulating rod is arranged in the spiral drum, and threads are formed in the regulating rod and used for screwing together with the spiral drum; one end of the regulating rod is connected with a wheel disc, the other end of the regulating rod is connected with a sealed cap, the tank body is connected with the sealing head through a first flange structure and a second flange structure, the wheel disc is screwed to enable the sealed cap to move up and down, when the sealed cap is attached to a boss, the wheel disc continues being screwed, and the sealing degree can be regulated; when pressure needs to be relieved, the sealed cap is separated from the boss. An inlet opening is formed in the lower portion of one side of the tank body, a pressure gauge is arranged on the middle of one side of the tank body, and a layer of insulating layer is arranged on the outside surfaces of the tank body and the sealing head. The pressure tank has the advantages of being simple in structure, convenient to use, and capable of not only ensuring the airtightness of the tank body, but also preventing the tank body from encountering outside power supply touching to cause danger.