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A design of vehicle active collision prevention and warning system based on wireless is proposed. The real -time detection and ranging of vehicles in front of the vehicle is realized by using the histogram of orientedgradient feature and support vector machine with single visual range model. The relative speed information is obtained by using the sensor wireless communication network. Finally, collision warning is realized according to the TTC warning model with relative vehicle distance and relative speed. The results show that the average processing time of the system is 100ms, the vehicle detection accuracy is 95%, and the distance error of the single visual measurement is less than ±4m, realizing real-time and accurate vehicle warning.