The invention relates to a switch converter module, in particular to a control method of a converter interconnection system constituted of multiple converters input series connection and output parallel connection and a feedback control circuit of a single converter therein. The control method of the converter interconnection system is used for achieving system control over the multiple converters in input serious connection and output parallel connection, by limiting a maximum duty cycle and a minimum duty cycle of a main switch tube in the single converter, the maximum input power of a converter module is limited, and through independent closed-loop voltage stabilization of the single converter, output voltage stabilization of the converter interconnection system is achieved.