The utility model discloses a seven level developments voltage recover device based on active clamp converter, including 10kV380V transformer, soft unit, first wave filter, rectifier unit, energy storage inverter unit, second wave filter, coupling transformer, bypass circuit breaker and detection the control unit. Link to each other through 10kV380V transformer, soft unit and first wave filter between rectifier unit and the 10kV electric wire netting, whole DC voltage charges for energy storage inverter unit's direct current electric capacity, direct current electric capacity is three electriccapacity cascaded structures, provides the energy for the active mid point clamper converter of energy storage inverter unit's seven level, the active mid point clamper converter of seven level produces the offset voltage through the contravariant to the DC voltage, and the offset voltage is coupled to three -phase 10kV electric wire netting through second wave filter filtering, the offset voltage of post -filter through coupling transformer, and coupling transformer is parallelly connected with the bypass circuit breaker, the active mid point clamper converter of rectifier unit and seven level all is connected with the modulating signal who is used for adjusting output voltage who detects the control unit output.