Traffic flow simulation method and device

The invention provides a traffic flow simulation method and device, and the method comprises the steps: generating a microscopic traffic simulation road network based on the road information of an electronic map, and converting the original vehicle trajectory data corresponding to the road information into vehicle trajectory data under a simulation road coordinate system corresponding to the microscopic traffic simulation road network; the vehicle speed and the lane where the vehicle is located are determined based on the vehicle trajectory data, and then microscopic traffic simulation of the simulation vehicle is carried out on the microscopic traffic simulation road network based on the vehicle trajectory data, the vehicle speed and the lane where the vehicle is located; and meanwhile, a virtual vehicle is created, and automatic driving simulation of the virtual vehicle is carried out based on the microscopic traffic simulation road network and the real-time state information of the simulation vehicle. Acco