This paper presents a control method of class E2 dc-dc converter with adjustable the peak switch voltage under input voltage fluctuation Class E2 dc-dc converter, which is one of the converter suitable for high operating frequency is studied. Class E2 dc-dc converter composed of a Class E amplifier and Class E rectifier. The amplifier side and rectifier side of class E2 dc-dc converter can achieve ZVS and ZDS. However, this converter can't cope with voltage fluctuation of renewable energy. The proposed circuit uses a voltage divider circuit on the amplifier side of the E2 class dc-dc converter. The peak switch voltage can be divided by the voltage dividing circuit. Furthermore, by varying the number of transistors that are connected in series, the value of the shunt capacitance can be approximately changed. The peak switch voltage can be reduced, and by using the synchronous switch, the output voltage can also be kept constant when the input voltage fluctuation.