Embodiments provide a screw, a food processing cup assembly, and a food processor. The screw includes a screw body including a feeding area for feeding and a crushing area connected to the feeding area; a first spiral rib is spirally arranged on the feeding area along the axial direction of the screw body, and extending to the crushing area along a top of the screw body; a cutting surface extending from the top of the screw body to the crushing area; second spiral ribs are disposed on the screw body at intervals along the axial direction of the screw body.