The invention discloses a smart energy HCCV ultrahigh-voltage crosslinking polyethylene-insulated power cable and a manufacturing method thereof. The method comprises the following steps: 1, manufacturing a compacted circular conductor or a segmentation conductor; 2, producing a crosslinking insulation core through an HCCV catenary suspension type crosslinking three-layer co-extrusion production line; 3, manufacturing a semiconductive buffer watertight layer with a longitudinal water-resisting function; 4, manufacturing a light and environmentally friendly extrusion seamless metal sheath with radial water resistance and corrosion resistance performance; and 5, manufacturing a waterproof and anticorrosion outer jacket. According to the method provided by the invention, the production efficiency is high, the investment cost is low, the ultrahigh-voltage crosslinking polyethylene-insulated power cable manufactured by use of the method has the advantages of high voltage grade, large transmission capacity, excellent electrical performance, convenient installation laying, low fault rate, easy maintenance and the like, the method is applied to a power station and a city power network, and the transmission demands of power and communication are satisfied.