The utility model discloses a refrigerant tank. A tank body is cylindrical, the height of the tank body is 900mm, the thickness of the side wall of the tank body is 10mm, the diameter of each of the upper inner undersurface and the lower inner undersurface is 300mm, and circumferences of round openings, 5mm in radius, formed along respective centers of the upper outer undersurface and the lower outer undersurface of the tank body vertically extend outwards for 75mm to form an upper inlet and outlet and a lower inlet and outlet. Storage volume, sealing safety and refrigerant incoming and outgoing rate are realized while technical requirements of the refrigerant tank are met.