Vehicle approaching warning device and control method

The invention provides a vehicle approaching warning device and a control method. The warning device comprises an anti lock braking system (ABS) wheel speed sensor connected with a calculation module. The ABS wheel speed sensor obtains wheel speed signals of a vehicle, and the calculation module obtains speed signals through operation; the calculation module is connected with an alarm control module which is connected with a vehicle approaching alarm switch and an alarm module, the alarm control module emits signals about whether to give an alarm according to speed values calculated through the speed calculation module, and the alarm module gives an alarm; the vehicle approaching alarm switch is connected with the alarm control module and used for controlling the opening or closing of the alarm control module, and the speed values calculated by the calculation module are compared with an alarm threshold of the alarm control module to generate alarm control signals; and the alarm module is connected with the a