The invention discloses a spiral extruding and sand discharging device for carrying out rotational flow reinforcing and sand removing. The device comprises a sand removing cylinder, a sand collecting cylinder, a sand discharging pipeline and a secondary rotational flow filtering mechanism. The secondary rotational flow filtering mechanism comprises a motor, a spiral extruding rod, spiral squeezing blades, a connecting disc, a filtering screen frame, a sand filtering screen and a rotational flow reinforcing device. The spiral extruding rod is fixedly connected with a motor, and the upper end of the spiral extruding rod extends into the bottom of the sand collecting cylinder. The spiral extruding rod is sleeved with the spiral squeezing blades. The rotational flow reinforcing device is fixedly installed on the top of the spiral extruding rod. The upper end of the rotational flow reinforcing device stretches into a cylindrical rotational flow cavity. The connecting disc is fixedly installed at the upper end of the spiral extruding rod in a sleeving mode. Multiple sand collecting plates are uniformly arranged on the upper surface of the connecting disc. Sand flowing holes are formed in the connecting plate. Separating can be achieved under the circumstance of low flowing speed of liquid in an inlet, and the device can operate continuously without intermittence.