The utility model discloses a cable fireproofing tray including a cover board and a tray body, the tray body includes a cable trough enclosed by a bottom board and two side plates, the cover board is clamped on the two side plates at the opening of the cable trough, the cover board bends along the width direction of the cable trough and is arc-shaped, the bottom board of the try body is provided with more than one reinforcing rib along the length direction of the cable trough, the bottom board and the two side plates are provided with through holes, and expansion fireproof material layers coat in the through holes. When the cable fireproofing tray is used, a cable is arranged in the cable trough, and the cover board is clamped to the opening of the cable trough. The through holes in the tray body facilitate air circulation in the cable trough and smoke evacuation, and acid-base liquids with corrosivity also can be discharged via the through holes. When high temperature or overheating caused by flame inside and outside the tray or other reasons occurs, the expansion fireproof material layers coating in the through holes expand to block the through holes, so that combustion mediums in the tray are naturally extinguished because of oxygen deficiency, and the cable can be effectively prevented from being damaged by natural or external fire.