Linked lock theft-proof lock for bicycle

The utility model discloses a linked lock theft-proof lock for bicycles, comprising a general locking pin and a special locking pin. A lock core and the lock pins are arranged in a movable lock body. The general locking pin controlled by a spring and a lock core stirring piece has general theft-proof function, and the special lock pin controlled by cipher is a chain movable lock which has interlocking function. The theft-proof lock can interlock objects and surrounding fixtures. The theft-proof lock has the advantages of firm structure and good theft-proof performance, and is suitable for bicycles and motorcycles.