This plant processing system comprises: a plant cultivation facility (1) that cultivates plants that include a sugar solution； a crushing facility (2) that crushes the plants that have been cleared by the plant cultivation facility (1)； a juicing facility (3) that harvests sap from plant chips obtained by the crushing facility (2)； a methane fermentation facility (5) that facilitates methane fermentation of the sap； and a power generation facility (6) that generates power using the biogas obtained by the methane fermentation facility (5) as fuel.
