Bluetooth automatic connection method and device, user equipment and vehicle-mounted equipment

The invention provides a Bluetooth automatic connection method and device, user equipment and vehicle-mounted equipment, and the Bluetooth automatic connection method is applied to the user equipment and comprises the following steps: when a Bluetooth demand signal sent by an application program is detected, starting Bluetooth connection and judging whether the Bluetooth connection is first-time connection or not; when the Bluetooth connection is the first-time connection, acquiring an authentication code from the vehicle-mounted equipment through a non-Bluetooth wireless network of which the connection is established in advance; authenticating the Bluetooth connection initiated by the application program based on the authentication code; and after the Bluetooth connection initiated by the application passes the authentication, confirming that the Bluetooth connection initiated by the application is secure connection, and establishing the Bluetooth connection between the user equipment and the vehicle-mounted