Lock pin with composite keyhole gate

Disclosed is a lock pin with a composite keyhole gate, comprising a lock body, a rotary core and a rotary core sleeve which are connected into integration by a rotary core sleeve key. The rotary core is provided with an axial lock hole; the front parts of the rotary core and the rotary core sleeve are provided with at least a group with two radial flat holes which are communicated with the lock hole; the block-shaped keyhole gate whose one end is provided with a convex circular arc is arranged in the flat hole. The position which is corresponding to the lock body is also provided with two radial flat holes; a plunger of the spring is arranged in the lock body; a key which is matched with the lock body is provided with two flat grooves at the corresponding position. As the front end of the lock core of the utility model is provided with the block-shaped keyhole gate shadowed; improper keyhole gate size can not open the lock; the mutually staggered multiple gates improve the performance of theft proofing. The utility model is simple in structure and low in cost.