The invention provides a high-voltage contactor. The high-voltage contactor comprises a base plate, a first fixed pin, a cylinder, a rear plate, a wiring terminal, a front plate, a telescopic rod, a second fixed pin, a reset spring, a round roller, a cam and a crank, and is characterized in that the cam is arranged on a fixed shaft in the center of the base plate in a rotating manner; the upper part of the cam is connected with the crank; the crank is articulated and connected with the front end of a piston rod of the cylinder; the rear end part of the cylinder is articulated onto the first fixed pin; the first fixed pin is vertically arranged on the base plate; and three arc grooves are uniformly formed in the cam. According to the high-voltage contactor, through the force amplification effect of the crank and the cam, the contact pressure between a V-shaped contact copper sheet and a contact becomes greater, and the reliability of contact is improved; and moreover, the cylinder cannot be heated in the long-time ventilation process, and the high-voltage contactor is safer and more reliable compared with an electromagnet.