The invention discloses an optimizing method of a central real-time dynamic traffic guidance path under a large-scale road network and relates to an optimization implementing method of a traffic guidance path. A device for implementing the optimizing method comprises a client computer, a server main node computer, a plurality of server slave node computers, an information exchanger and terminal equipment, wherein traffic road network topological structures and road section roadlock data which are acquired by a data acquisition module of the client computer are uploaded to the server main nodecomputer, and through the processing of the server computer, an optimal path result is sent to the terminal equipment through the client computer. The method has important significance to relieve city road network traffic jams and greatly reduces the price of vehicle mounted equipment.