The invention discloses a cross-linked polyethylene insulated corrugated aluminum sheathed polyvinyl chloride sheathed longitudinal water-blocking flame-retardant cable, comprising a split conductor,wherein a semi-conductive nylon tape is lapped right outside the split conductor, and then a PPD tape is lapped left outside the semi-conductive nylon belt; a semi-conductive inner shielding layer, aninsulating layer and a semi-conductive outer shielding layer are extruded sequentially outside the PPD tape in a three-layer co-extrusion manner; a semi-conductive water blocking tape is lapped outside the semi-conductive insulating shielding layer, a semi-conductive buffer water blocking tape lapped in the direction opposite to the lapping direction of the semi-conductive water blocking tape islapped outside the semi-conductive water blocking tape, a corrugated aluminum sheath is arranged outside the semi-conductive buffer water blocking tape, and the outer surface of the corrugated aluminum sheath is coated with asphalt and then extruded with a polyvinyl chloride outer sheath. The power cable has the excellent advantages of high strength, impact resistance, resistance to environmentalaging pre-stress cracking, corrosion resistance, low temperature resistance, easy welding, simple construction, strict sealing without leakage, light unit weight, high strength, heat insulation, flameretarding, water blocking, corrosion resistance, no water absorption, convenient and quick construction and the like.