PURPOSE: A producing method of red pepper paste using sweet potato and fermented soybeans, and the red pepper paste are provided to improve the taste of the red pepper paste. CONSTITUTION: A producing method of red pepper paste using sweet potato and fermented soybeans comprises the following steps: mixing 100 parts of sweet potato by weight with 16-28 parts of malt extract by weight; heating the mixture to obtain syrup; mixing the syrup with sun-dried red peppers, fermented soybean powder, and bay salt, and aging the mixture; and adding starch syrup into the mixture after heating the mixture for 6 hours, and secondly heating the mixture for 2 hours. The using sweet potato is used after boiling.본 발명은 고구마와 청국장 분말을 이용한 고추장의 제조 방법 및 상기 방법에 의하여 제조된 고추장에 대한 것이다. 본 발명의 고추장은 매운 맛과 단 맛의 조화가 훌륭하여 풍미가 뛰어나다.