The invention provides a food waste processing device. The food waste processing device comprises a stander, a crushing device, a dehydration device and an oil-water separation device, wherein the crushing device, the dehydration device and the oil-water separation device are arranged on the stander; the oil-water separation device comprises a collection tank, the collection tank comprises an oilextraction section and a collection section, the width of the collection section gradually decreases towards the oil extraction section, and an oil collection tank is formed in the end part of the oilextraction section; a roller is arranged between two side walls of the oil extraction section, and a third quadrant and a fourth quadrant of the roller are located in the oil extraction section; scraping plate seats are arranged above two side walls of the oil collection tank, a swingable scraping plate is hinged between the two scraping plate seats, one end of the scraping plate abuts against and is in contact with an outer column wall of a second quadrant of the roller, and the other end of the scraping plate downwards extends into the oil collection tank; and an oil baffle is arranged in the oil extraction section and is located between the side wall of one side, close to the oil collection tank, of the oil extraction section and the roller. According to the food waste processing device, the thickness of an oil surface during the oil-water separation can be effectively improved, the oil-water separation efficiency can be improved, and the rapid oil-water layering can be realized.