The utility model discloses a large capacity current transformer capacitor fixing structure comprising an upper clamp body and a lower clamp body matched and respectively in a cylinder shape; the top of the lower clamp body is provided with a plurality of elastic buckles along the periphery of a cylinder wall; the upper clamp body is a hollow cone; the bottom of the upper clamp body is provided with a plurality of thickened reinforced platforms along an outer side of the cylinder wall; the thickened reinforced platforms are provided with vertical through holes. The beneficial effects are that a socket structure hoop capacitor can prevent up-down jumping and left-right rotation of the capacitor, and the capacitor can be fixed on an iron capacitor fixing piece; the large capacity current transformer capacitor fixing structure is high in assembling efficiency, reliable in fixation, made of plastic material, so no burr can penetrate the capacitor, and insulation highland barley paper can be omitted; a few screws in a vertical direction can hoop the capacitor and fix the capacitor and a capacitor mounting piece, thus solving the problems of inconvenient bolt installation when an iron fixing clip clamps the capacitor with side faces.