The invention relates to a low-voltage winding structure of an on-load capacitance regulation transformer, a winding method of the low-voltage winding structure and a transformer. The low-voltage winding structure comprises a low-voltage I segment, a low-voltage II segment, a low-voltage III segment and five leading-out copper bars, wherein the three segments are all manufactured by winding copper coils and are led out by copper bars, the low-voltage III-segment is arranged at an inner side, the low-voltage I segment and the low-voltage II segment are axially arranged in parallel and are arranged at an outer side, the low-voltage III segment are led out by an x copper bar and an x2 copper bar, the low-voltage I segment is led out by an a1 copper bar and an x1 copper bar, the low-voltage II segment is led out by an a2 copper bar and an x2 copper bar, and the copper bar x2 is arranged in a way that the low-voltage III segment and the low-voltage II segment share the same bar. In the winding structure, the low-voltage III segment is firstly wound, and the copper bar x and the copper bar x2 are led out to the left; secondly, the low-voltage II segment is wound and is temporally fastened after the winding of turns of the low-voltage segment is completed; thirdly, the low-voltage I segment is wound, and the copper bars a1 and x1 are led out to the left; and finally, the copper bar a2 is led out. The structure is manufactured by winding the copper foils and has the characteristics of good manufacturability, high winding efficiency, high product mechanical strength and the like, a lead is simple and clean to assemble, and the short-circuit resistant capability of the transformer is improved.