PURPOSE: A heat insulating door device for repairing furnace walls of chamber of coke oven is provided to prevent additional damage of refractories by enabling operation to be performed without temperature drop of the coke oven chamber and prevent safety accident by safely protecting workers from high temperature of the coke oven chamber. CONSTITUTION: In a heat insulating door device for easily repairing damaged parts such as cracks on the furnace walls of coke oven chamber formed in a process of performing dry distillation and extrusion by charging coal into coke oven, the heat insulating door device(1) comprises furnace wall repairing doors equipped with a frame(12) having the same size as coke oven door devices and mounted on both sides of the coke chamber; mirrors(20) a plurality of which are formed in a length direction of the doors to observe an inner part of the coke oven chamber from the outside of the doors; and nozzles(30) a plurality of which are longitudinally installed on the furnace wall repairing doors, and which are equipped with separation type pipes(35) installed on a casing mounted on the doors in such a way that a ball is rotationally mounted on the separation type pipes to spray mortar that is a furnace wall repairing material onto the damage parts.
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