Antitheft lock

The utility model relates to an antitheft lock which comprises springs, spring bolts, a lock body, a lock cylinder, lock pins and a key, wherein lock pin slots and a lock cylinder slot are formed in the lock body; the lock pins are mounted in the lock pin slots; 3-40 lock pins are sealed in the lock pin slots by the springs and the spring bolts; gear grooves are formed in the lock pins; the heights of the gear grooves in the lock pins are the same or different; the lock cylinder is mounted in the lock cylinder slot; a lock cylinder gear is arranged on the lock cylinder; the number of teeth of the lock cylinder gear is equal to that of the lock pins; the lock cylinder gear is meshed with or staggered from the gear grooves formed in the lock pins through rotation of the lock cylinder. By adopting the technical scheme, only the gear grooves in all the lock pins and the lock cylinder gear are positioned on the same plane and are matched, the antitheft lock can be unlocked; the confidentiality coefficient of a lock device can be increased, and the antitheft performance of the lock device is improved.