The invention belongs to the technical field of a power system breaker, in particular to a contact adhesion preventing breaker. The breaker comprises a DC contactor and a closing coil; the DC contactor comprises a connection support plate, an insulating pull rod, a static contact and a moving contact; the static contact is connected with the closing coil through a lead; the lower part of the connection support plate is provided with a bracket which is provided with an electromagnet correspondingly matched with the insulating pull rod; the electromagnet is connected in parallel with the closing coil through a lead; and the conductive line of the electromagnet is provided with a delay relay. Due to the additionally arranged electromagnet and delay relay, the breaker has the advantages that the long-time electrification and burning phenomenon of the closing coil can be effectively avoided, the safe operation of power grid equipment is ensured and the reliability of the power grid equipment and the power supply reliability of the power grid are effectively improved; and moreover, the breaker has the advantages of simple structure, reliable performance, economical efficiency, practicability and the like, and is convenient in installation,.