Anti-interference passive lock

The utility model discloses an anti-interference passive lock which comprises a lock shell, a lock cylinder, a circuit board and an electromagnet. The lock shell is provided with a mounting cavity, and a lock hole is formed in the mounting cavity; the lock cylinder is rotationally matched in the lock hole; the circuit board is fixedly matched in the mounting cavity and is electrically connected with the lock cylinder; the electromagnet is arranged in the mounting cavity and electrically connected with the circuit board, an iron core of the electromagnet is movably matched with the lock cylinder, rotation of the lock cylinder is limited when the iron core stretches out, and the lock cylinder can rotate freely when the iron core retracts; an anti-interference structure made of magnetic conductive materials is arranged between the electromagnet and the front end face of the lock shell, and the area and the position of the anti-interference structure meet the requirement that at least the electromagnet is covered