The invention relates to a mounting structure of series static contacts of a circuit breaker. The mounting structure is composed of a pedestal (1) and series static contacts (2) and is characterized in that the series static contacts (2) are installed outside the back of the pedestal (1). Because the static contacts are installed outside the back of the pedestal, an accident caused by arc discharging and leakage of moving and static contacts can be prevented by the insulating pedestal, so that the mounting and maintenance difficulty can be reduced. Besides, with changing of static contact shapes, the part cost can be reduced. Moreover, because of changing of the static contact structure, the directions of currents flowing through the moving and static contacts are opposite, so that the electro-dynamic repulsion force between the moving and static contacts increases and thus the breaking performance of the product is improved.