The invention provides a heavy circulating ball type double-die electric steering gear. The heavy circulating ball type double-die electric steering gear comprises a steering gear housing assembly, an input shaft and screw assembly, a gear sector shaft assembly, a supporting seat assembly, a worm gear, a worm, an inner end cover assembly, a steering angle and torque sensor, an outer end cover assembly, a quincuncial connecting sleeve assembly and a motor assembly, wherein the motor assembly is treated as a power source, and the power is transmitted to the input shaft and screw assembly through the worm gear and the worm; the input shaft and screw assembly can output the torque and angular displacement through a gear sector shaft; the input shaft locking device has two control modes, namely, an angle position control mode and a torque boosting control mode. According to the heavy circulating ball type double-die electric steering gear, a large-reduction ratio mechanism, the steering angle and torque sensor and the like are adopted to replace a turning valve structure of a circulating ball type hydraulic power steering gear; the hydraulic transmission is converted into intelligent electric transmission on the premise that the space is not additionally increased; the power consumption is reduced by 300% and the maximum output torque is increased by 5% by being compared with those of the circulating type hydraulic power steering gear with the same size.