The invention provides a pedal lock for an escalator or an automatic pedestrian path. The pedal lock comprises a lock case, a lock cylinder, a spring, a lock rod, a locking plate and an end cover, wherein an outer ring stage of the lock cylinder and an inner ring stage of the lock case are stopped in a way of being matched with each other; the lock rod passes through a hole of the end cover, the spring and a central hole of the lock cylinder; a stop stage on the lock rod is matched with the lower end face of the lock cylinder; the end faces of the lock rod, the lock cylinder and the lock case are flush with one another; the lower end of the lock rod is provided with the locking plate; and the spring is arranged between the lock cylinder and the end cover. By adopting the structure, firstly, the lock cylinder and the lock case are in sliding fit with each other and the lock cylinder and the lock rod are in sliding fit with each other, a gap between the lock case and the lock cylinder and a gap between the lock case and the lock rod are small, so water and dust are prevented from entering the lock; and in the resetting process of the lock cylinder, dust or water between the lock cylinder and the lock case and between the lock cylinder and a carrier rod is ejected, so unavailable unlocking of a key of the lock is effectively prevented; secondly, since the end faces of the lock rod, the lock cylinder and the lock case are flush with one another, incorrect operation due to treading can be effectively prevented; thirdly, the lock can be unlocked in a staircase only by rotating the carrier rod; and fourthly, the pedal lock has the advantages of simple structure, no precision component and convenient manufacturing and maintenance.