The invention discloses a reversing contactor, which is composed of an electromagnetic construction member, a movable contact bridge construction member (8), an upper contact bridge (10), a lower contact bridge (11), a curve contact bridge (12), a curved bridge stud (13), a reset spring (15) and a shell (9), wherein, the electromagnetic construction member comprises an iron core (1), a coil (2) and a lower magnet conducting plate (3), wherein, a magnet conducting outer ring (4) is arranged at the periphery of the coil (1); the magnet conducting outer ring (4) and the lower magnet conducting plate (3) surround the coil (2) and the iron core (1) in a U-shaped square manner; and an upper magnet conducting plate (5) is arranged above the coil (1). The upper magnet conducting plate, the magnetconducting outer ring and the lower magnet conducting plate wholly encase the coil and the iron core in a full surround type, so as to lead the coil and the iron core to have less leaked magnetism quantity and less magnetic loss when in operation, thereby improving the utilization of the electromagnetism, and promoting the quality of the product.