The invention discloses a Bluetooth bidirectional communication intelligent lock, which comprises a mechanical part, a motor module, a controller module, a storage module, a clock module, a touch screen module, a sound module, a power supply module, a Bluetooth module, a shielding can, a doorframe contact, a departure button, an indicator light, a key controller module, a key power supply module, an input module, a key Bluetooth module, and a key clock module. The invention is characterized in that positions of a key and the intelligent lock can be effectively judged through the intensity of a Bluetooth signal; the intelligent lock and the key can recognize each other in a bidirectional communication manner; and a key code is sent after the recognition succeeds. Current time is taken as a secret key, and communication information is encrypted through an AES algorithm. In comparison with the prior art, the lock needs no person to approach a sensor, and is relatively simple in system and comparably low in power consumption. The key code is protected through bidirectional matching; the key is prevented from copying; and the transmission content can be changed in real time. Monitoring is prevented, and the lock is relatively safe.