The invention provides a vertical low-temperature storage tank. The vertical low-temperature storage tank comprises a frame and a tank body; the tank body comprises a shell, an inner container and a supporting structure for supporting the bottom of the inner container in the shell; a reinforcing ring is arranged on the inner wall of the shell; in the supporting structure, a connecting part comprises a casing pipe and a plurality of drawing strips, and the outer ends of the drawing strips are connected with the reinforcing ring; a supporting part is arranged in the casing pipe in a penetrating manner, and the upper end of the supporting part is connected with a lower seal head of the inner container; a heat insulation ring is fixedly arranged in the casing pipe and arranged on the supporting part in a sleeving manner; a limiting part is connected with the casing pipe, a heat insulation block and the supporting part; according to the supporting structure, the distance between the inner container and the shell is reduced, so that the inner container and the shell can be stably and tightly connected, the transport efficiency of the storage tank is ensured, heat transmission of the inner container and the shell can be effectively isolated, the good heat insulation low-temperature environment in the storage tank can be ensured, the storage tank is also suitable for the shell without the lower seal head, the structure is simple, and earlier-stage machining and later-stage worker actual assembly are facilitated.