The invention discloses a rectifying unit structure. The rectifying unit structure comprises a frame, a rectifying bridge unit and a water cooling pipeline system, wherein the frame comprises upper and lower base plates and side plates on the two sides; the rectifying bridge unit is in a press string form, and comprises a top peg, a guide sleeve, a disc spring, a gasket, an insulating disc, a water-cooled radiator, a diode, a top column, a bus bar and a discharge resistor; the water cooling pipeline system comprises a quick joint, a water inlet and outlet passage, a pipeline, a pipe joint and a sealing member. The rectifying unit structure has the advantages that the power device, the radiating device, the bus bar and the like are arranged in the frame by the unit through a press string mechanism, the structure is more compact and attractive, the disassembly, assembly and maintenance are facilitated, the conductive contact is more uniform, and the electric performance is good; the radiating mode is water-cooled radiating, the radiating capacity is high, and the high-power radiating requirement can be met; the water cooling pipeline system is arranged on the outer side of the unit, is good in sealing, convenient to disassemble and assemble and an interface can be quickly plugged and pulled; the bus bar is skilful and rational in design, and the insulation protection is safe and reliable.