The invention discloses a contactor of a dual-magnetic-circuit system. The contactor comprises a main contact magnetic circuit system and an auxiliary contact magnetic circuit system. The main contactmagnetic circuit system is composed of a contact system a and an electromagnetic system a, a contact sealing cavity of the contact system a is subjected to vacuum pumping and air inflation, the electromagnetic system a and the contact system a are cooperatively installed, and the electromagnetic system a can be used for driving the contact system a; the auxiliary contact magnetic circuit system is installed at the bottom of the main contact magnetic circuit system and comprises a contact system b and an electromagnetic system b, the contact system b and the electromagnetic system b are cooperatively installed, and the electromagnetic system b can drive the contact system b. According to the contactor of the dual-magnetic-circuit system, through separation design of the main contact magnetic circuit system and the auxiliary contact magnetic circuit system, the load of the dual-magnetic-circuit system is reduced, the contact pressure of a main contact and an auxiliary contact is increased, the service life of the contactor is prolonged, and the reliability of the contactor is improved.