The utility model discloses a switch magnetic resistance electric drum, comprising a switch magnetic resistance electric drum and a controller which controls the switch magnetic resistance electric drum. In the utility model an outer rotor is the electric drum, the outer rotor and the driving drum are integrated together, the speed reducer is completely saved, the driving drum has compact structure, and the installation space is reduced. The stator of the electric drum is the double salient pole 36/24 teeth structure, the stator is provided with an integral winding, the rotor is provided with no winding, the carbon-free brush is also provided with no permanent magnet, and the quantity of maintenance is small. A circuit breaking brake contracting coil is arranged inside the drum, the system has low starting current and high starting torque, the starting times per hour is unlimited, and the uninterrupted continuous starting and braking works can be done. The system has high power and efficiency in the entire regulation range and great regulation and control performance, can operate in four quadrants and can realize the regenerative braking.