Abstract: A car door lock is disclosed. The car door lock comprises: a lock casing; an actuation mechanism mounted on the lock casing; and a press mechanism located outside the lock casing; wherein the door lock further comprises a pull rod extending through the lock casing to connect with the actuation mechanism and the press mechanism, the actuation mechanism enables the opening and closing of the press mechanism via a linear movement of the pull rod. The lock casing is provided with a hole for receiving the pull rod, a protruding platform is formed on the periphery of the hole, the pull rod is provided with a groove for fitting the seal ring, and the seal ring is located within the hole when the pull rod is moved in the hole. The car door lock solves the waterproof problem in positions between the press mechanism and the lock casing.