The invention relates to a control technology of a high-voltage frequency converter in an electrical system, in particular to an energy feedback brake device of the high-voltage frequency converter. An energy feedback control circuit of the device comprises a current direction detection circuit for detecting the direction of the output current of a power unit and an energy feedback working condition judgment circuit for controlling that an inverter bridge in the control unit is in the normal working state or in the energy feedback state during the energy feedback, as well as a feedback trigger circuit which is used for triggering the conduction of the inverter bridge device in the high-voltage frequency converter power unit; the current direction detection circuit and the energy feedback working condition judgment circuit are connected to a control input end of the feedback trigger circuit, and four output ends of the feedback trigger circuit are respectively connected with the inverter bridge device of the power unit. The device can be used for a multi-level high-voltage frequency converter with a serial power unit; furthermore, the device has simple structure, small loss, low cost, high power factor and no harmonic pollution to an electric fence.