The utility model relates to a grit separator after ore washs, including the muddy water groove, muddy water groove both sides respectively are provided with the one fixed bolster, are provided with the shaft between two fixed bolsters, are provided with rotatory the fill in the shaft, and rotatory fill suspension is in muddy water groove top, be provided with a plurality of baffles on rotatory the fill, the baffle top flushes with the rotatory top of fighting, the bottom and the rotatory bottom of fighting of baffle meet, and are provided with the welding gap, the baffle will rotate a fill branch separate a plurality of bucket, and the tip in muddy water groove is provided with conveyor, the shaft connection is provided with the motor. The utility model discloses can effectively solve present ore and rinse that the back is direct discharges washing away the muddy water that the back produced, not do further recovery processing to muddy water, can not abundant recycle grit, extravagant great, the discharge of muddy water simultaneously is easy to lead to the fact the problem of jam to the discharge tube, and the separation of the muddy water of can the wide application discharging after the ore rinses utilizes the field.