The utility model relates to a vehicle collision pre-warning system which comprises a first subsystem, a second subsystem and a third subsystem. The first subsystem comprises a comprehensive information processing module, a vehicle OBD information collecting module, an acceleration information collecting module, a GPS information collecting module and a first 802.11a wireless receiving and sending module, and the vehicle OBD information collecting module, the acceleration information collecting module, the GPS information collecting module and the first 802.11a wireless receiving and sending module are electrically connected with the comprehensive information processing module through serial ports. The second subsystem comprises a body and surrounding vehicle information storage area, an inter-vehicle information exchange module, an inside-vehicle information exchange module and a collision detection module, and the inter-vehicle information exchange module, the inside-vehicle information exchange module and the collision detection module are electrically connected with the body and surrounding vehicle information storage area. The third subsystem comprises a vehicle collision pre-warning module. The vehicle collision pre-warning system is reasonable in structural design, easy and convenient to mount and apply and safe in use, information of a vehicle and information of surrounding vehicles can be collected and exchanged in real time, collision detection is reliable and precise, efficiency is high, traffic accidents can be effectively reduced, and casualties can be reduced.