The invention discloses a vehicle anti-collision method. The vehicle anti-collision method comprises the following steps that S1, distance measuring is conducted on a front vehicle through an ultrasonic distance measuring method; S2, the distance between two vehicles is divided into the reminding distance, the alarming distance and the forced braking distance, and an anti-collision mathematical model is established; and S3, speed information of the vehicles is obtained and substituted into the established anti-collision model, and St, Sw and Sd are calculated; (1) if the distance between the vehicle and the front vehicle is within the reminding distance St, a reminding signal is sent to tell a driver that at this time the two vehicles are too close, and after hearing the reminding, the driver is ready to slow down; (2), when the distance between the vehicle and the front vehicle is within the alarming distance Sw, an alarming signal is sent, and after hearing alarming, the driver is on the alert and pays attention to the driving condition of the front vehicle at any time, so that driving is guaranteed; and (3) when the distance between the vehicle and the front vehicle is within the forced braking distance Sd, a deceleration signal is forced to send to the vehicle to enable the vehicle to reduce the speed to increase the distance between the two vehicles, and the driving risk factor is reduced.