The invention discloses a system for transforming kitchen waste into a new energy. The system comprises a protein feed producing system and a biodiesel producing system, wherein the protein feed producing system comprises a crusher, a separator, a stirrer, at least two driers and at least two fermentation devices; and the biodiesel producing system comprises an oil-water separator, a reaction kettle, a condenser, a rectifying tower and an intermediate tank to which an antioxidant can be added. According to the system, the kitchen waste can be transformed into protein feed and biodiesel, wherein the protein feed can be used for feeding livestock, while the biodiesel can be utilized as a clean energy, therefore the pollution problem of the kitchen waste is solved, but also the kitchen waste is actually recycled and changed into valuable materials.