The invention discloses a method of converting food waste into fuel oil by industrialized biological decomposition, and is characterized in that the characteristic that some organisms in nature prefer to live on food waste is utilized and a large-scale industrial production method is adopted to ensure that the organisms are grafted in links of the entire production system and mainly devote to conversion of biological oil by digestion and decomposition. In addition, most of other products produced are crushed and processed to enter a feed store to be mixed with the food waste for further digestion, decomposition and conversion of the biological oil while some parts thereof are directly served as the feed. Therefore, a recycling industrial chain in purpose of oil production can be formed after such recycles.