The invention relates to a control method of a high-frequency isolation type variable-topology AC-DC converter, belongs to the technical field of electric energy conversion, and aims to solve the problem that the control system of the existing high-frequency isolation type AC-DC converter is large in size, high in cost and low in apparent power utilization rate. According to the control method ofthe high-frequency isolation type variable-topology AC-DC converter, the output power closed-loop control is set by controlling two single-pole double-throw switches to be in serial connection or parallel connection according to the relation between the actual value of the direct current side voltage and the rated value, two bridge-type converter output voltage balancing algorithms are set, and current-sharing control of the two bridge-type converters in the parallel connection mode is realized, and voltage-sharing and current-sharing control in the serial connection mode is achieved. The method is used for electric energy conversion.