A power converting device for a hybrid, comprising: a first accumulating unit disposed between a first inverter connected to an engine auxiliary motor and a second inverter connected to a load motor, and accumulating electric energy generated by the engine auxiliary motor; a second accumulating unit configured to accumulate the electric energy accumulated by the first accumulating unit, the electric energy generated by the engine auxiliary motor, and electric energy generated through a generating operation of the load motor; an initial charging unit comprising a DC-DC converter and an inductor disposed between the first accumulating unit and the second accumulating unit, and configured to charge the electric energy accumulated in the first accumulating unit to the second accumulating unit; a switching unit (270, 280) configured to switch a connection between the initial charging unit and the second accumulating unit, and a connection between the second accumulating unit and the first accumulating unit, respectively; and an initial charging control unit configured to match first accumulated voltage sensed at the first accumulating unit and second accumulated voltage sensed at the second accumulating unit, respectively, to each other during initial ignition, by controlling the switching unit (270, 280) to connect the first accumulation unit and the second accumulating unit; wherein the switching unit (270, 280) comprises: a first switching unit configured to switch the connection between the initial charging unit and the second accumulating unit to charge the second accumulating unit; and a second switching unit configured to switch the connection between the second accumulating unit and the first accumulating unit to drive the load motor. a first accumulating unit disposed between a first inverter connected to an engine auxiliary motor and a second inverter connected to a load motor, and accumulating electric energy generated by the engine auxiliary motor; a second accumulating unit configured to accumulate the electric energy accumulated by the first accumulating unit, the electric energy generated by the engine auxiliary motor, and electric energy generated through a generating operation of the load motor; an initial charging unit comprising a DC-DC converter and an inductor disposed between the first accumulating unit and the second accumulating unit, and configured to charge the electric energy accumulated in the first accumulating unit to the second accumulating unit; a switching unit (270, 280) configured to switch a connection between the initial charging unit and the second accumulating unit, and a connection between the second accumulating unit and the first accumulating unit, respectively; and an initial charging control unit configured to match first accumulated voltage sensed at the first accumulating unit and second accumulated voltage sensed at the second accumulating unit, respectively, to each other during initial ignition, by controlling the switching unit (270, 280) to connect the first accumulation unit and the second accumulating unit; wherein the switching unit (270, 280) comprises: a first switching unit configured to switch the connection between the initial charging unit and the second accumulating unit to charge the second accumulating unit; and a second switching unit configured to switch the connection between the second accumulating unit and the first accumulating unit to drive the load motor. a first switching unit configured to switch the connection between the initial charging unit and the second accumulating unit to charge the second accumulating unit; and a second switching unit configured to switch the connection between the second accumulating unit and the first accumulating unit to drive the load motor.