The utility model discloses a plug -in mounting rod number board support, it includes rod number board fixed bolster frame, the rod number board stand frame is formed by two support face bondings, and is equipped with the draw -in groove between two support faces, the welding has hexagon socket head cap screw's nut part on the support face of rod number board stand frame, corresponds the hole that is equipped with installation hexagon socket head cap screw on another support face, still be equipped with the bolt hole of fixed rod number board support on the rod number board stand frame. This plug -in mounting rod number board support has reduced the degree of difficulty of demolising rod number board, has improved operation personnel's work efficiency to make rod number board and support not take place to warp, obtain reuse. Simultaneously, this plug -in mounting rod number board support is popularized and applied to transmission line and transformer substation's warning sign and the fixed mode of phase sequence tablet in, makes transmission line rod number board in time installed, and every basic shaft tower has all had exact circuit name and pole number, has avoided the personnel of operation teams and groups to step on the emergence of the pole circumstances by mistake.