The invention discloses an oxalic acid powder feeding machine for an oxalic acid catalytic debinding furnace in powder metallurgy. The oxalic acid powder feeding machine comprises a material storage assembly, a material transferring assembly and a heating assembly, wherein the material storage assembly is used for storing an oxalic acid raw material and comprises a crushing device for crushing the raw materials; the material transferring assembly is used for transferring the crushed raw material in the material storage assembly into the heating assembly; the heating assembly is used for heating and sublimating the crushed oxalic acid raw material; the material storage assembly comprises a material storage box, a material storage box cover arranged at the top of the material storage box, a stirrer arranged in the material storage box and used as the crushing device, and a stirrer driving motor which is used for driving the stirrer to run; the material storage box is arranged at the upper part of the material transferring assembly and comprises a material outlet; the raw material in the material storage box can flow into the material transferring assembly from the material outlet. The oxalic acid powder feeding machine has the advantages of being high in control precision, convenient to operate, high in safety, high in material supplying efficiency, and the like.