The invention relates to the technical field of an electric motor, in particular to a coaxial inner-outer coil electric motor, comprising a main shaft and a motor, wherein the motor comprises a shell, a permanent magnet rotor as well as an outer stator coil and an inner stator coil; wherein the outer stator coil and the inner stator coil have opposite polarity and are provided with steel silicon slices, the outer stator coil is arranged in an inner wall groove of the shell; the permanent magnet rotor is penetrated through the outer stator coil, and the inner stator coil is coaxially arranged in the inner wall of the permanent magnet rotor; and the main shaft is penetrated through the inner stator coil, the two ends of the main shaft are connected with the shell by a bearing, and the main shaft is fixedly connected with the permanent magnet rotor. The coaxial inner-outer coil electric motor has larger output torque, more ideal energy-saving effect and wider application range.