The invention discloses a high-voltage capacitor comprising a casing and a core, wherein the core comprises a cylindrical core rod and a multilayer winding body; the winding body comprises a first composite body, a second composite body, a third composite body and a fourth composite body; the first composite body includes a first insulating medium layer and a first electrode layer; the second composite body includes a second insulating medium layer and a second electrode layer; the third composite body includes a third insulating medium layer and a third electrode layer; the fourth composite body includes a fourth insulating medium layer and a fourth electrode layer; the second electrode layer and the first insulating medium layer are provided with a first misalignment; the third electrodelayer and the first insulating medium layer are provided with a second misalignment; the third electrode layer and the first insulating medium layer are provided with a first misalignment; and the separation distance of the first misalignment, the second misalignment and the first misalignment are successively decreased. The high-voltage capacitor is simple in structure, fully utilizes the spaceof the insulating mediums and the electrodes, has high insulation reliability, and can almost double the specific capacitance.