Large low-temperature storage tank

The utility model provides a large low-temperature storage tank. The large low-temperature storage tank comprises a steel tank body and a concrete outer wall arranged on the outer side of the steel tank body. The steel tank body comprises a cylinder with an opening in the top end, a vault covering the top end of the cylinder and sealing the cylinder, and a plurality of anchoring parts arranged inthe circumferential direction of the vault at intervals, and the anchoring parts are arranged in the extending direction of the periphery of the bottom end of the vault and located on the outer side of the cylinder. The concrete outer wall comprises a top cover wall covering the arch crown, a side wall annularly arranged outside the cylinder body and an annular wall connected between the top coverwall and the side wall; the tops of the side walls are lower than the top of the cylinder body; the bottom of the annular wall is connected with the top of the side wall, the top of the annular wallupwards exceeds the cylinde