The present invention relates to a composition for preventing, curing, and treating prostatitis, and a food composition which contain an Ecklonia cava extract or phlorotannin extracted from Ecklonia cava. The Ecklonia cava extract contains more than 90 wt % of phlorotannin compare to the total weight of the Ecklonia cava extract. [Reference numerals] (AA) Inflammatory cell infiltration; (BB) Acinus change; (CC) Interstitial fibrosis; (DD) Control group; (EE) Ecklonia cava extract group; (FF) Hormone-induced prostate contagious germ; (GG) Ecklonia cava extract treatment group; (HH) NSAID treatment group본 발명은 감태 추출물 또는 감태에서 추출된 플로로탄닌을 유효성분으로 포함하는 전립선염의 예방, 치료 또는 개선용 약학 조성물 및 식품 조성물에 관한 것이다.