The invention relates to an energy bidirectional control strategy applicable to an LLC resonant converter. The energy bidirectional control strategy comprises the steps of 1, setting driving pulses of switch tubes S1 and S4 in a primary full-bridge circuit of the LLC resonant converter to be square waves with duty ratio being 50%, wherein the driving pulses of switch tubes S2 and S3 are complementary to the driving pulses of the switch tubes S1 and S4, and dead time shall be reserved between the driving pulses of the switch tubes S2 and S3 and the driving pulses of the switch tubes S1 and S4; 2, setting widths of driving pulses of switch tubes V1, V2, V3 and V4 in a secondary full-bridge circuit of the LLC resonant converter to be 0.5Tr, wherein the switch-on time of the V1 and V4 is synchronous to the switch-on time of the S1 and S4, and the switch-on time of the V2 and V3 is synchronous to the switch-on time of the S2 and S3; 3, acquiring a voltage vb of an output side of the LLC resonant converter by a voltage sensor; and 4, comparing the voltage vb of the output side with a reference v, performing operation on a difference value by a PI controller, performing voltage-frequency conversion, and finally obtaining a switch period Ts. Therefore, bidirectional flowing of energy can be automatically adjusted.