PROBLEM TO BE SOLVED: To provide an organic fertilizer production system capable of changing large volumes of livestock excrement into organic fertilizer efficiently and in a short time by using housefly larva.SOLUTION: The organic fertilizer production system 10A includes: a feed creation means that mixes rice husks 54 and bean curd lees 55, which increase feeding by larva, with excrement 18 to create feed 19； a feed housing means that houses a prescribed volume of the feed 19 in a feed housing tray 20； an egg inoculation means that inoculates house fly eggs 51 in the feed 19 housed in the housing tray 20； a larva raising means that feeds the feed 19 housed in the housing tray 20 to the larva hatched from the eggs 51 and raises the larva to create a fertilizer base for organic fertilizer by the enzymatic degradation of the feed 19 inside the larva and the excretion of the same by the larva during the larva raising processing； and a separation means that separates the larva and the fertilizer base from each other by using the peristaltic dispersion behavior that is active in the larva arriving at the pupa metamorphosis stage.【課題】イエバエの幼虫を利用して家畜の多量の排泄物を短期間に効率よく有機肥料に変えることができる有機肥料製造システムを提供する。【解決手段】有機肥料製造システム１０Ａは、幼虫の食性を増進させるもみ殻５４、おから５５を排泄物１８に混合して餌食１９を作る餌食作成手段と、所定量の餌食１９を餌食収容トレー２０に収容する餌食収容手段と、収容トレー２０に収容された餌食１９にイエバエの卵５１を接種する卵接種手段と、収容トレー２０に収容された餌食１９を卵５１から孵化した幼虫に食させて幼虫を飼育し、幼虫の飼育過程において餌食１９が幼虫の体内で酵素分解されてその幼虫から排泄されることで有機肥料の肥料基材を作る幼虫飼育手段と、蛹変態期を迎えた幼虫の活発な蠕動離散習性を利用して幼虫と肥料基材とを分別する分別手段と実施する。【選択図】図１
