A grinding and dewatering apparatus by centrifugation for highly selective differentiated food waste collection includes, in a supporting structure, a hopper introducing waste-products into a grinding chamber and subsequently into a centrifuge having an inner body and an outer body with a finely perforated, coaxial side wall, a deceleration chamber of the filtered water, a motor driving a grinding unit and the centrifuge, wherein the motor integrally activates both the grinding unit and the centrifuge and overlies both, and a discharge for evacuation of the ground waste-products. Both the grinding unit and the inner and outer bodies of the centrifuge are positioned in a deceleration chamber and are arranged integrally with a rotating disc, and the discharge is a movable discharge, that can be selectively positioned below openings, situated in a flanged extension arranged below for closing the centrifuge for the evacuation of the ground waste-products into a collection basket.