The invention provides a three-phase superconductive variable-leakage-reactance controlled electric reactor which comprises three single-phase controlled electric reactors, and is characterized in that each single-phase controlled electric reactor comprises an iron core, an alternative-current working winding, a plurality of sets of superconductive windings, and independent switches, the plurality of sets of superconductive windings are sequentially wound on the iron core from inner side to outer side, each set of superconductive winding is provided with one independent control switch, and the alternative-current working winding is wound at the outermost layer of the superconductive winding. According to the real time load of the system, the three-phase superconductive variable-leakage-reactance controlled electric reactor can regulate self reactance by controlling the control switch on each superconductive wingding in a staged manner, so that the idle-work requirement of a dynamic compensation system is satisfied, transmission loss is reduced, power supply quality is improved, the idle-work requirement of a user and stable voltage requirement of the system are satisfied; the variable-leakage-reactance controlled electric reactor has the advantages of simple structure, safety and reliability and convenience in maintenance; the superconductive windings have no loss in long-term operation; and the variable-leakage-reactance controlled electric reactor can be directly used in high-voltage power grids of 35kV or above, thereby meeting the high-voltage and high-capacity development requirement of the electric system.