PURPOSE: A producing method of processed sulfur powder, and a feed feeding method using the processed sulfur powder are provided to offer the processed sulfur powder to animal feed for improving the growth rate of domestic animals. CONSTITUTION: A producing method of processed sulfur powder comprises the following steps: heating sulfur at 80-160 deg. C for 50-70 minutes; mixing the heated sulfur and water in a weight ratio of 1-1.5:4-6 to obtain a sulfur solution; mixing radish juice, mung beans, a Kalopanax pictus extract, a Japanese apricot extract, a Leonurus sibiricus extract, and Bidens bipinnata to obtain a mixture; adding the mixture into the sulfur solution, and heating the mixture at 100-120 deg. C for 60-90 minutes before cooling for 4-5 hours; heating the cooled mixture at 100-150 deg. C, and cooling before separating the precipitated sulfur from the supernatant; adding the radish juice, the mung beans, the Kalopanax pictus extract, the Japanese apricot extract, the Leonurus sibiricus extract, the Bidens bipinnata, and yellow soil water into the separated sulfur; heating and cooling the mixture for 2 times, and separating the precipitated sulfur and the supernatant; and drying the separated sulfur.본 발명은 유황용해액에 무즙, 녹두, 엄나무 추출액, 매실엑기스, 익모초 추출액 및 도깨비풀을 이용하여 제조하는 것을 특징으로 하는 법제유황분말 또는 액상법제유황의 제조방법에 관한 것으로, 상기 제조된 법제유황분말 또는 액상법제유황을 가축용 또는 양식수산물 사료에 첨가할 경우 가축 또는 수산물의 성장률 및 면역력을 증진시킬 수 있고, 또한, 식물 재배 시 살포할 경우 식물 병해를 방제할 수 있다.