The invention relates to an expressway automotive anti-collision system based on a global positioning system (GPS) broadcast mode, which belongs to the technical field of radar communication and the electronic field of automobiles. The expressway automotive anti-collision system based on the GPS broadcast mode comprises a GPS receiving antenna, a difference GPS receiving machine, a central processor, a wireless transmitting receiving device, a radio frequency antenna and a displayer, wherein the GPS receiving antenna is connected with the difference GPS receiving machine, the difference GPS receiving machine, the wireless transmitting receiving device and the displayer are respectively connected with the central processor, and the radio frequency antenna is connected to the wireless receiving device. By receiving position information of surrounding automobiles and automobile self-position information, making analysis of position relationships, and calculating relative speed relationships between automobiles, the relative position relationships and the speed relationships of the surrounding automobiles are provided and displayed on the displayer. By adopting the expressway automotive anti-collision system based on the GPS broadcast mode, automobiles do not need refitting. On the basis of the existing automobile allocation equipment foundation, by adding software updating and upgrading, the expressway automotive anti-collision system based on the GPS broadcast mode achieves a high-performance judging system, requires low cost and improves active detection ability of automobiles.