A juice extractor and a feeding apparatus thereof are provided. The feeding apparatus includes a feed channel, a feed body connected to an upper port of the feed channel, and a cover plate assembly. The cover plate assembly includes a cover plate and an accommodating cavity with a large capacity. A shape of the cover plate matches an inner wall of the feed body and the cover plate is provided with a feed inlet, and the cover plate is rotatably provided on the inner wall of the feed body. The accommodating cavity with a large capacity is provided on a top surface of the cover plate, and has a sectional area greater than an area of the feed inlet, and is formed by an enclosure plate that surrounds the feed inlet. Upon inversion of the cover plate assembly, an opening of the accommodating cavity with a large capacity can be made to face the feed channel, and fruits and vegetables contained in the accommodating cavity with a large capacity are put in the feed channel. The feed inlet of the feed body is provided on the invertible cover plate assembly, so that not only diced fruits and vegetables are conveyed to the juice extractor, but also fruits and vegetables with large shapes fall into the feed channel by reverting the cover plate assembly without being diced. The juice extractor has a simple structure and can be conveniently used, so as to improve use safety.