The invention relates to a bidirectional CLLLC-DCX resonant converter and a control method thereof. The converter comprises two ports, two resonant circuits, two switching circuits and a transformer.The bidirectional CLLLC-DCX resonant converter disclosed by the invention is symmetrical in circuit structure and consistent in forward and reverse working performance. Under the control method of theinvention, the bidirectional CLLLC-DCX resonant converter can well realize ZVS or ZCX soft switching of input-side and output-side switch tubes and can realize the constant voltage gain under normalload. In addition, the converter has a bidirectional automatic power limiting function due to the existence of an auxiliary diode, the natural bidirectional flow of energy in forward and reverse operation modes is realized at the same time, and the efficiency and reliability of the converter are improved.