The embodiment of the invention provides a cross-platform vehicle communication method and system. The method mainly comprises the following steps: arranging an enhanced DSRC (Dedicated Short Range Communication) communication protocol unit capable of processing communication data of at least two communication protocols and at least two single protocol communication units in a vehicle; when the vehicle communicates with other equipment, judging whether the other equipment supports an enhanced DSRC communication protocol, if so, communicating with the other equipment by the vehicle through the enhanced DSRC communication protocol unit, or else, selecting one single protocol communication unit supported by the other equipment to communicate with the other equipment by the vehicle. According to the cross-platform vehicle communication method and system, the traditional design thought of a vehicle communication system restricted to the DSRC communication protocol is changed, the extension of definition of the vehicle communication system is expanded, different communication functions are managed in a concentrating manner, the vehicle communication system is not restricted to a communication platform of the specific communication protocol and becomes a cross-platform communication system by taking the DSRC as a core, and the communication protocol supported by the other equipment can be flexibly selected to communicate with the other equipment.