A suspension cantilever arm device with integral positive position support comprises a flat cantilever arm, an oblique cantilever arm welded below that flat cantilever arm and a positioning tube welded on the outside of the oblique cantilever arm; Symmetrically welding two adjusting plates above the outer end of the flat cantilever arm; The oblique cantilever arm consists of horizontal segment I and oblique segment I; The positioning tube comprises an inclined section II, a horizontal section II, a vertical section and a horizontal section III, and the inclined section II is parallel to the inclined section I; The inner end of the flat cantilever arm is articulated with the adjustable cantilever base I through the insulator I, the lower end of the inclined cantilever arm inclined section Iis fixedly connected with the inclined brace articulated on the adjustable cantilever base II through the insulator II, and a rotatable load-bearing cable seat is arranged above the adjusting plate;An adjustable positioner mount is positively fixed on the horizontal section II of the positioning tube, and a finite positioner is positively installed at the end of the adjustable positioner mount.The invention has the advantages of stable structure, convenient installation and easy adjustment.