Automobile and rear door anti-collision device thereof

The invention discloses an automobile and a rear automobile door anti-collision device thereof. The rear automobile door anti-collision device comprises a guide rail baffle and a lock structure. The guide rail baffle is connected with a rear door; the lock structure is arranged between the guide rail baffle and an external interface assembly of the automobile. The external interface assembly comprises an external interface shell and an external interface cover plate. The lock structure comprises a lock pin, a spring bolt and a transmission part, and the lock pin is connected with the spring bolt through the transmission part; the lock pin is used for being inserted into the outer connector shell and can move in the direction close to or away from the center of the outer connector shell when the outer connector cover plate is opened or closed so as to drive the spring bolt to be switched between the locking position and the unlocking position through the transmission component. When the external interface cove