The invention discloses a method for making a heat insulation board by using hard polyurethane foamed waste, relates to the technical field of building heat insulation, and also relates to the technical field of waste hard polyurethane foam recycle. The method comprises the following steps of: mixing sucrose polyether, aid, foaming agent, active agent and phenol to form a polyether mixture, mixing polyaminoether polyol, flame retardant, fluorine-free foaming agent and reclaimed hard polyurethane heat insulation material to form reclaimed powder, mixing the reclaimed powder and the polyether mixture, and adding isocyanate to form a mixed die material; and putting the mixed die material into a die, putting the die into a drying oven, curing and opening the die, and obtaining the heat insulation board by cutting. By the method, the hard polyurethane heat insulation waste is fully utilized, and a large amount of hard polyurethane foamed waste formed by eliminating products can be consumed, so that substantial contribution is made to the protection of natural environment.