The utility model provides a regenerative brake electric energy utilizes device power unit, relate to the control of power quality field, it includes frame body (1), radiator (2), the power subassembly, main control board subassembly (4) and capacitance assembly (6), install on frame body (1) radiator (2), the power subassembly is by IGBT (3), female arrange (5) of a set of absorption capacitors and IGBT stromatolite are constituteed, IGBT (3) fixed mounting is on radiator (2), absorption capacitors fixes the upper end in IGBT (3) one by one, arrange in IGBT (3) top in female arrange (5) of IGBT stromatolite, and fastening connection, main control board subassembly (4) comprise control panel (4 -1) and drive plate (4 -2), the utility model has the advantages of reasonable design the compactness, it is convenient to install, energy -conserving remarkably productive, and the outward appearance is graceful, has fine market spreading value.