METHOD FOR CONNECTING BLUETOOTH KEY TO VEHICLE, VEHICLE BLUETOOTH SYSTEM, AND BLUETOOTH KEY

A method for connecting a Bluetooth key to a vehicle, a vehicle Bluetooth system, and a Bluetooth key, comprises: when a mobile terminal enters a preset distance range of a vehicle, a Bluetooth master module of the vehicle performs authentication and connection with a Bluetooth key of the mobile terminal according to preset key information (S); after the Bluetooth master module is successfully connected to the Bluetooth key, the Bluetooth master module generates an original random code and encrypts the original random code to obtain an encrypted random code (S); the Bluetooth master module sends the original random code to a Bluetooth slave module, and sends the encrypted random code to the Bluetooth key (S); and the Bluetooth slave module and the Bluetooth key perform bidirectional authentication according to the encrypted random code and the original random code, and when bidirectional authentication succeeds, the connection is established (S).