Elevator car door lock

The utility model discloses a door lock of an elevator car door. The triangular lock comprises a triangular lock cylinder, a lock ring, a sliding block beating rod, a clamping spring and a lock plate.A triangular key hole is formed in the center of the outer end face of the triangular lock cylinder. A lock cylinder positioning ring is formed at the periphery of the triangular key hole; the lock ring is formed on the periphery of the lock cylinder positioning ring. A lock cylinder shaft is formed in the center of the end of the side, away from the lock ring, of a lock cylinder rod of the triangular lock cylinder. The sliding block beating rod comprises a fastening part and a beating rod block; the fastening part of the sliding block striking rod is sleeved and positioned on the lock cylinder rod of the triangular lock cylinder and is positioned on the back surface of the lock ring; the beating rod block integrally extends and is formed from the fastening part to the lock cylinder shaft; the snap spring is slee