This study aimed to determine the effect of tofu waste as a feed mixture to the growth of earthworm Pheretima sp. This research was conducted in Bengkulu City and Animal Husbandry Laboratory of Bengkulu University. This research used method of Completely Randomized Design with 4 treatments and 5 replicates: (P1) = Rice husk 50% + Feces of cow 50% + (0% tofu waste), (P2) = Rice husk 50% + Cow feces 45% + (5% tofu waste), (P3) = Rice husk 50% + Cow feces 40% + (10% tofu waste), (P4) = Rice husk 50% + Cow feces 35% + (15% tofu waste). The result of this research showed that the feeding of mixed ration with the stofu waste worm in Pheretima sp was very significant (P <0.01) to the growth of Pheretima sp earthworm weight and significantly affected (P <0.01) on the offsprings weight on each maintenance unit, and was significantly different (P <0.05) on the average of offsprings body weight per head.Key words: tofu waste, mixture of feed, growth, earthworm Pheretima sp. ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh pemberian ampas tahu sebagai campuran pakan terhadap pertumbuhan cacing tanah Pheretima sp. Lokasi penelitian ini dilaksanakan di Kota Bengkulu dan Laboratorium Peternakan Universitas Bengkulu. Penelitian ini menggunakan metotede Rancangan Acak Lengakap (RAL) dengan 4 perlakauan serta 5 ulangan: (P1) = Sekam padi 50% + Feses sapi 50% + (0% ampas tahu), (P2) = Sekam padi 50%+Feses sapi 45% + (5% ampastahu), (P3) = Sekam padi 50% + Feses sapi 40% + (10% ampas tahu), (P4) = Sekam padi 50% + Feses sapi 35% + (15% ampas tahu). Hasil dari penelitian ini menunjukan bahwa pemberian pakan campuran ampas tahu pada media cacing tanah Pheretima sp berpengaruh sangat nyata (P<0,01) terhap pertumbuhan bobot induk cacing tanah Pheretima sp dan berpengaruh sangat nyata (P<0,01) terhadap bobot badan anak per unit pemeliharaan serta berbeda nyata (P<0,05) terhadap rataan bobot badan anak per ekor.Kata kunci: ampas tahu, campuran pakan, pertumbuhan, cacing tanah Pheretima sp.