The utility model discloses a floor-type OPGW (Optical fiber composite overhead ground wire) excessive cable box in a substation, which is used for placing excessive optical cables of the substation. The excessive cable box comprises a box body. Doors are mounted on the front and back sides of the box body by hinges. An optical fiber box, an excessive cable frame for winding optical cables and a fixing card for fixing the excessive optical cables are fixed on a fixing frame inside the box body. The excessive cable frame and the box body are connected with the ground by wires and ground lines. A ridge-shaped top cover is mounted on the top of the box body, and mounting holes and optical cable incoming/outgoing holes are arranged at the bottom of the box body. According to the utility model, the excessive optical cables of the substation, the optical fiber box and guide optical cables are sealed as a whole, and the laying and mounting of the incoming optical cables in the substation are specified, thereby reducing safety hidden troubles.