The invention relates to a control system for an automatic jacking tank of electric hoists. The control system comprises n central supports, n electric hoists, a control device, a positioning device and a slideway, the central supports are fixedly arranged on the inner side of the tank, the electric hoists are fixed on the central supports, the electric hoists are divided into basic electric hoists and adjusting electric hoists, the positioning device is mounted on the lower portion of the tank, the slideway is arranged at positions on the central supports and corresponding to the positioning device and matched with the positioning devices, and the control device comprises a PLC (programmable logic controller), a weighted limiting switch and at least one inclination angle sensor. By the control system, the problems of positioning of the lower portion of the tank and inclination degree control of the tank or re-balancing of the tank after inclining when the jacking tank with the electric hoists invertedly mounted are solved.