The present invention relates to a deoxidant, a packaging paper packaging the deoxidant, and a method for manufacturing the packaging paper, wherein the deoxidant suppresses the microwave absorption of iron itself, which is a main ingredient of the deoxidant, to suppress the increase in the internal temperature of the packaging paper and the expansion of the packaging paper due to moisture evaporation, thereby preventing the damage of the packaging paper in advance. The deoxidant of the present invention is composed of an iron powder, a carrier, and a promoter for promoting the oxidation of the iron powder, wherein the iron powder is blended with granular diatomite or powdered diatomite and the mixture is press-mixed by a ball mill or rod mill, thereby allowing the iron powder to be stuck in the diatomite granules or coated on the diatomite granules. According to the deoxidant, the packaging paper packaging the deoxidant, and the method for preparing the packaging paper of the present invention, the microwave absorption of iron itself, which is a main ingredient of the deoxidant, is suppressed. Therefore, in order to suppress the increase in the internal temperature of the packaging paper and the expansion of the packaging paper due to moisture evaporation, the iron powder is stuck in the diatomite granules or coated on the diatomite granules, thereby preventing the iron powder from absorbing the microwave, thus fundamentally suppressing the temperature increase of the deoxidant. In addition, the present invention provides a packaging paper having appropriate air permeability and a method for manufacturing the same, and thus can suppress the moisture evaporation due to the temperature increase, which may occur in spite of the supply of the deoxidant according to the present invention, and the resultant expansion in the packaging paper, thereby solving problems of the conventional art.본 발명은 탈산소제의 주요성분인 철 자체의 마이크로웨이브 흡수를 억제하여 포장지 내부 온도 상승을 억제하고 수분의 증발에 따른 포장지의 팽창을 방지하
