The invention discloses a prefabricated joint for a high-voltage direct-current cross-linked polyethylene cable, belonging to the field of high-voltage direct-current power transmission of an electric system. The prefabricated joint comprises a high-voltage shielding layer, an external semi-conductive shielding layer and a reinforced insulator, wherein the external semi-conductive shielding layer is formed outside the high-voltage shielding layer; the reinforced insulator is clamped between the high-voltage shielding layer and the external semi-conductive shielding layer; an interface between the external semi-conductive shielding layer and the reinforced insulator is a stress cone; and the distance between the end part of the high-voltage shielding layer and the root part of the stress cone is an internal creeping distance. In the prefabricated joint for the high-voltage direct-current cross-linked polyethylene cable disclosed by the invention, electric field distribution is optimized, and the interface has sufficient safety margin; and the prefabricated joint has the advantages of light weight, small size, simple structure and the like, and has an important popularization value in the field of power transmission of high-voltage direct-current cross-linked polyethylene cables in electric systems.