The utility model, which belongs to the technical field of fireproof plugging, provides a fireproof plugging device at a joint of a wire duct and a cabinet, which comprises a wire duct, a limiting rod, a cover plate, a lateral fireproof plate, a first fireproof plate, a second fireproof plate, a fireproof bag and fireproof mud. The wire duct comprises side plates, a back plate and a bottom plate.A first strip-shaped hole and a second strip-shaped hole which are parallel to each other are formed in the side plate; a first connecting hole is formed in the bottom plate; limiting rods are arranged in the first strip-shaped holes and the second strip-shaped holes in a penetrating mode, and the limiting rods are distributed on the two sides of the cable. The lateral fireproof plate seals a gapbetween the first strip-shaped hole and the second strip-shaped hole; the first fireproof plate penetrates through the cable and is arranged on the surface of the cabinet; the cover plate is fixed between the two side plates; the second fireproof plate penetrates through the cable, and the edge of the second fireproof plate abuts against the cover plate and the back plate. According to the plugging device, the fireproof mud, the fireproof plate and the fireproof bag are combined for plugging, so that the defects caused by single-material plugging are eliminated, the plugging effect is improved, and the fireproof grade is higher.