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Aim to solve the problems of big delay,low accuracy and poor stability of localization under the high-speed situation of vehicles,play all the advantages of three positioning modes,including GPS,RSSI and INS systems. We combine GPS differential algorithm with RSSI ranging together to get abscissa,and fuse RSSI ranging and INS iterative algorithm to get ordinate,propose a multi-mode differential fusion precise localization algorithm for high-speed vehicles. During the simulation experiments based on a four-lane highway scene,the tracking error is less than 1 m,localization delay is less than 0.2 s when the speed is 70 km/h. Experimental results show that the algorithm can achieve lane-level localization accuracy,there are broad promotion prospects in the field of precise intelligent transportation and Vehicle Collision Avoidance System.