Collision locking device for rear split seat of vehicle

Disclosed is a collision locking device for a rear split seat of a vehicle, the collision locking device including a striker structure mounted on a seatback of a left seat of the rear split seat or a seatback of a right seat thereof and a locking device mounted on the seatback of the left seat of the rear split seat or the seatback of the right seat thereof, wherein the seatback of the left seat and the seatback of the right seat are coupled to each other by a locking operation of the locking device configured to be locked and coupled to the striker structure in the event of impact occurrence due to vehicle collision, thereby preventing the seatback of the left seat or the seatback of the right seat from being deformed form the original position thereof.