The invention discloses an electric rotary cultivator. The electric rotary cultivator comprises a track, a track rack, an electric track car, a first hydraulic expansion link, a suspension support, a connection support, a rotary cultivation support, side supports, a guide rod, a second hydraulic expansion link, two lock catches, outer covers, a motor center shaft, electrodes, tool piles, rotary cultivation blades and a soil baffle. The upper end of the connection support is fixed to the lower end face of the suspension support through screws. The rotary cultivation support is welded to the lower portion of the connection support. The two side supports are welded to the inner end portion and the outer end portion of the rotary cultivation support respectively. The two lock catches are installed in the middle portions of the side supports on the inner side and the outer side through bolts. The two ends of the motor center shaft are fixedly installed on the lock catches. The outer covers are installed at the inner end and the outer end of the motor center shaft through bearings. Motors are arranged in the outer covers. The tool piles are fixedly installed on the outer covers. The rotary cultivation blades are movably installed on the tool piles. The electric rotary cultivator has the advantages of being safe, environmentally friendly and high in efficiency.