The anti-back-locking escape door lock for the
rail transit comprises a lock body and a lock head, the lock head comprises a lock head shell part, a lock cylinder
assembly, a lock head shifting piece, a
steel ball spring and a
steel ball, the lock head shell part is connected with the lock body, and the end, facing the lock body, of the lock cylinder
assembly sequentially penetrates through the lock head shell part and the lock head shifting piece. The end, away from the lock body, of the lock cylinder
assembly extends out of the lock body, the lock head poking piece is connected with the lock cylinder assembly and rotates along with rotation of the lock cylinder assembly, an inner cavity is formed in the lock head shell component, one end of the
steel ball spring is connected with the top of the inner cavity, and the other end of the steel ball spring is connected with the steel ball. The inner cavity is formed in the lock head body, the steel ball and the steel ball spring are movably arranged in the inner cavity, and the steel ball groove is formed in the surface of the lock cylinder, so that the lock cylinder can only rotate in one direction when rotating, and when the lock cylinder rotates in the opposite direction, the steel ball is clamped in the steel ball groove to prevent the lock cylinder from being reversely locked, and the escape door does not have the reverse-direction reverse locking function; therefore, the escape door is prevented from being locked in emergency to
delay escape time, and personal injury is avoided.