The invention provides a middle car seat parking lock. The middle car seat parking lock is characterized by comprising a lock shell, a lock blade and a trip dog, wherein the lock blade and the trip dog are movably arranged on one side of the lock shell. The lock blade can mesh with the trip dog, lock plunger slots are formed in the lock shell, one side of the lock blade is provided with a first opening capable of being matched with one lock plunger slot, and the other side of the lock blade is provided with a second opening. The middle car seat parking lock is matched with a seat mechanism to move forward for a certain distance, and then a seat is turned over, so that the lock blade rotates to a locking position by one lock plunger abutting to the first opening of the lock blade, the second opening is matched with the other lock plunger for locking while the lock blade rotates, and the trip dog withstands and stops the lock blade so as to complete locking, so that passengers get on or off a car more conveniently; moreover, the middle car seat parking lock is simple and stable in structure.