The invention provides an aseismic structure in a double-shell low-temperature in-tank tank. The aseismic structure comprises an anchor belt box, a cover body and an anchor belt, wherein the anchor belt box is arranged in a bearing table foundation, the top end is exposed out of the upper surface of the bearing table foundation and penetrates through an outer tank base plate to be in sealed welding to the outer tank base plate, the cover body is exposed out of the lower surface of the bearing table foundation and seals the bottom end of the anchor belt box, the lower end of the anchor belt penetrates the anchor belt box to be connected with the cover body, and the upper end of the anchor belt is movably connected with an inner tank wall. According to the aseismic structure, the anchor beltpenetrates the anchor belt box in the concrete bearing table foundation to be connected with the exposed cover body, the anchor belt is not in contact with the anchor belt box and is not in contact with the outer tank base plate, and the problem of low-temperature damage of the outer tank and the bearing table foundation due to the fact that cold of a low-temperature inner tank is transmitted toan outer tank and the bearing table foundation is solved; tearing force damage caused by the anchor belt to the outer tank base plate during an earthquake is avoided; the inner tank wall is movably connected to the upper end of the anchor belt, additional tension generated by the anchor belt to the inner tank wall can be avoided, the low-temperature inner tank is fixed during the earthquake, the earthquake force of a tank body is directly transmitted to a pressure bearing platform, and lift-off damage is prevented from being generated on the low-temperature inner tank during the earthquake.