The utility model provides a storage type liquid nitrogen tank. The tank comprises a tank body and a tank body bracket, at least two first supporting pads are fixed outside the tank body; a clamping groove with an opening in one side deviating from the tank body is formed in the first supporting pad; a clamping block is sleeved with the clamping groove in a sliding mode, the clamping block is connected with the bottom of the clamping groove through a spring, a supporting block is arranged on the first supporting pad at the opening end of the clamping groove, an inserting groove is formed in the supporting block, an inserting strip is inserted into the inserting groove, the inserting strip blocks one end of the clamping block, and the clamping block is limited in the clamping groove; the tank body support comprises a bottom plate used for being supported at the bottom of a tank body and a vertical plate perpendicularly fixed to the bottom plate. A second supporting pad opposite to the first supporting pad is arranged on the side, facing the tank body, of the vertical plate. The second supporting pad abuts against the end of the supporting block, a driving block is further inserted into the center of the second supporting pad, one end of the driving block penetrates through the vertical plate, the other end of the driving block penetrates through the second supporting pad in a sliding mode and abuts against one end of the supporting block, and the fixing device is simple in structure, convenient to fix and better in reliability.