The invention discloses a super-capacitor which comprises a cylindrical shell, an end cover, a positive electrode current collector, a negative electrode current collector, an electrode core and electrolyte solution, wherein the top of the cylindrical shell is open. Two ends of the electrode core are welded with the positive electrode current collector and the negative electrode current collector respectively, a liquid injection port is formed in the top of the end cover, double grooves are formed in the periphery of the end cover, arc length of the upper groove is larger than that of the lower groove, a groove is formed in the outside of the negative electrode current collector and matched with the lower groove of the end cover to form a splicing groove, the splicing groove is welded at the combined arc position between the end cover and the negative electrode current collector, a space between the shell and the end cover is filled with an integral sealing ring, double grooves are formed in the integral sealing ring and fitted with the upper groove and the splicing groove, the position of the shell corresponding to double circular arcs of the integral sealing ring is notched, so that the integral sealing ring is extruded, and the bottom of the shell is provided with six projected reinforcing ribs and a lower groove. The super-capacitor is reasonable in structural design, high in strength, good in reliability and vibration resistance and large in effective sealing area, and space is saved.