The utility model belongs to the technical field of engines, and relates to a magnetoelectric drive rotary variable valve assembly, which aims to solve the problems of complex drive and transmission mechanisms, incapability of flexibly and continuously changing valve motion parameters and the like in the prior art. The device mainly comprises a cam, a cam shaft, a rotor body, a rotor bolt, a rotorgear, a stator iron core, a stator support, a stator support bolt, a tappet, a valve spring, a valve, a valve guide pipe, a cylinder cover, a ground screw, a rocker arm, a pin shaft, a rocker arm support, a rocker arm support bolt and three sets of wire sets. The stator iron core is fixedly connected with the stator support and is arranged in the rocker arm; the rotor body is fixedly connected with the rotor gear, is in threaded connection with the rocker arm and is arranged between the cam and the stator iron core, the three wire sets are wound on the opposite stator iron cores respectively,the stator iron cores attract the rotor gear to drive the rotor body to rotate up and down after being powered on, the distance between the cam and the rotor body is changed, and therefore the opening moment of the valve is changed. The utility model has the advantages of space saving, simple assembly and high working efficiency.