The invention discloses a screw-type adjusting plate for an electric power line, belongs to the technical field of electric power line connection fittings, and aims at solving the technical problems that a wire length adjusting device for the electric power line is low in labor intensity and can carry out live-working. According to the technical scheme, the screw-type adjusting plate for the electric power line comprises an adjusting plate body, a screw body and a slide block body, wherein an adjusting plate connecting hole is formed in one side of the adjusting plate body; a through hole which is narrow in two ends and wide in middle is formed in the middle of the adjusting plate body; a slide chute is formed in the middle of the through hole; a guide rail is arranged at one side of the slide chute; the screw body is arranged in the through hole in the middle of the adjusting plate body; the slide block body is arranged in the through hole in the middle of the adjusting plate body; a through threaded hole is formed in the slide block body; the slide block body is in threaded connection with the screw body through the through threaded hole; one end of the slide block body and the slide chute are in clearance fit; a guide rail stop bench at the other end and the guide rail are in sliding connection; and a slide block connection hole is formed in one side of the slide block body. The screw-type adjusting plate for the electric power line is applied to an adjustment of wire sag of the electric power line.