A differential magnet-control shape-memory alloy performer includes MSMA elements, a magnet, an excitation coil, iron-core, two pairs of magnet baffle plates, a connecter and an excitation circuit controller. Excitation coil is winded on the iron-core laminated by dynamic steel, the connector is at center of the gap preserved between two cores, the MSMA elements magnet baffle plates and the magnet are set symmetrically along the gap from the connector to both sides, the two cores are connected by a press board and screws, finally, the excitation coil is connected to the current controller. The magnet generates bias magnetic fields with equal diameter and same direction in two MSMA elements and the excitation coil current generates a control magnetic field in equal diameter and counter direction, one field is increased, the other is reduced by laminating the two fields. The connector moves since the deformation volumes of the two MSMA elements are different to control the shift of the performer.