The invention belongs to the technical fields of advanced manufacture and information, in particular to a method for reducing switching times of mixed-model assembly line products of an automobile. The method centers the problem that a multi-workshop (or an assembly line) is related and optimized in the production process of complicated products and can be used for reducing the switching times ofthe mixed-model assembly line products by using an annular buffer area and combining a mixed progressive multi-object genetic algorithm. In the invention, by using the mixed progressive multi-object genetic algorithm, the model production of the mixed-model assembly line of the automobile can be optimally sorted, the material balance of the production line, and the production load balance and therelevant stand of the just-in-time production environment can be considered, so that the model sequence put into production can ensure the smoothness of material consumption, the adjusting time of the model can be shortest and the aim of reducing the switching times of the production line products can be achieved.