The invention discloses an electromagnetic automobile seat belt. The electromagnetic automobile seat belt comprises a lock latch and a lock body, wherein an inserting groove is formed in the lock body; a lock hole is formed in the lock latch; an electromagnet and a toggle switch are arranged on one side of the inserting groove; the electromagnet is connected with a bus of an automobile through the toggle switch; a toggle block which communicates with the toggle switch is mounted outside the lock body; a sliding groove is formed in the other side of the inserting groove; sliding rails are arranged on opposite side walls of the sliding groove an armature is mounted in the sliding groove; a bulge capable of being clamped in the lock hole is arranged at the top end of the armature; the bottom end of the armature is fixedly connected with the bottom of the sliding groove through a pull spring; and an arc-shaped pressing surface is arranged on the top side of the bulge. According to the electromagnetic automobile seat belt disclosed by the invention, the arc-shaped pressing surface is arranged, so that when the armature is under a closing condition, force can also be applied to the lock latch to squeeze away the armature, and the situation that the lock latch can be clamped and locked is guaranteed; and in addition, toggling the toggle block can enable the electromagnet to be under an active power failure condition, so that the seat belt can be loosened under the situation that the automobile normally runs, and basic using requirements of the seat belt are met.