Modulated reflecting type optical access control system

The invention discloses a modulated reflecting type optical access control system comprising a lock body 1 and a key 2, wherein the lock body 1 comprises an actuating motor 11 for a locking mechanism, a signal processing circuit 12, a system power supply 13, an optical source transceiving module 14, a power supply outlet 15 of the lock body, and an optical window 16 at one end of the lock body; and the key comprises an optical window 21 at one end of the key, a power supplying inlet 22 of the key, a reflecting surface 23, a piezoelectric device 24, a drive circuit 25, and an identification code storage and output module 26. The modulated reflecting type optical access control system realizes the modulated reflecting type identification code transfer and identification technology, and can be widely applicable to systems such as access control, and the like.