The invention discloses a motor starting device which comprises an arc extinguishing cover, a static core and a moving core arranged in the arc extinguishing cover, and a contact plate arranged above the arc extinguishing cover. Two ends of the bottom of the contact plate are provided with moving contact points. The top of the arc extinguishing cover is provided with static contacts which are corresponding to the moving contact points one to one. The static cores are in the shape of a hollow cylinder. An insulation sheath goes through the center of the static core and is internally provided with multiple parallel conductive wires. A conductive wire at the same side of the static core goes through the insulation sheath and then is split into two wire harnesses. Two sides of the static core are provided with two mounting grooves which are internally provided with wire connection bodies. The wire harnesses are connected to the wire connection bodies through a metal connection plate. The motor starting device provided by the invention has reasonable space utilization and can adapt to large impact current.