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In order to reduce the risk of vehicle lane changing collision in the merging area of highways and improve the quality of road traffic, a coordinated decision-making and control system for lane changing in the merging area of highways is optimized and designed in the context of vehicle networking. Optimize the hardware system by installing the Internet of Vehicles terminal chip and modifying the coordination controller. According to the physical structure of the highway confluence area, set constraints for lane changing areas. Collect vehicle route information in the confluence area of highways in the context of vehicle networking, and make lane changing coordination decisions based on the calculation results of lane changing urgency, following vehicle lane changing behavior, and workshop distance safety. Plan the optimal coordinated lane change trajectory in the merging area as the system control objective, and ultimately calculate the position and speed control variables. With the support of the controller, achieve the coordinated lane change control function in the expressway merging area. Through system testing, it is concluded that the designed system has a lane change collision probability of 0.15% and a road congestion degree of 0.20%, respectively. The road traffic flow has been significantly improved, with an average value of 356 pcu/d. The vehicle speed control error is 0.05km/h, and the experimental results show that the designed system has significant advantages in decision-making and control performance.