The invention relates to low-nickel steel for a low-temperature storage tank. The low-nickel steel is prepared from, by weight, 0.05%-0.15% of C, 0.20%-0.60% of Si, 1.0%-1.70% of Mn, 0.30%-1.0% of Ni,0.20%-0.70% of Cr, 0.20%-0.70% of Mo, 0.01%-0.05% of Nb, 0.01%-0.05% of Ti, 0-0.005% of S, 0-0.008% of P and the balance Fe and impurities. The low-nickel steel for the low-temperature storage tank is smelted through converter, LF and VD refining, and precise control over the content of the steel component and the content of gas in the steel is guaranteed; in the whole process of continuous casting, protective casting and plate blank slow cooling are conducted, and the internal quality of a casting blank is guaranteed; controlled rolling is conducted to guarantee refining of the initial organization; heat treatment adopts the process of quenching and tempering to obtain a uniform and fine tempered sorbite organization, and the strength and low-temperature toughness of a steel plate can besufficiently guaranteed. Only a small amount of Ni, Cr, Mo, Nb and Ti are added in the steel, controlled rolling is conducted, afterwards, quenching and tempering treatment is adopted, and the steelfor the LPG liquid tank capable of being used for the environment with the temperature not lower than minus 80 DEG C is obtained.