Feeding device of sandstone separator

The utility model provides a feeding device of a sandstone separator, and relates to the field of concrete processing equipment. The feeding device of the sand-gravel separator comprises a separating box, a discharging groove and a supporting frame, sliding groove bases are fixedly connected to the two sides in the discharging groove correspondingly, a screening net is arranged between the two sliding groove bases, two rotating plates are fixedly connected to the bottom of the screening net, a second rotating column is rotationally connected between the two rotating plates, and the second rotating column is fixedly connected to the bottom of the screening net. According to the feeding device of the sand and stone separator, sand and stone are prevented from directly falling into the discharging groove and damaging the discharging groove, large sand and stone fall into the discharging groove after being smashed, damage of the sand and stone to the discharging groove is greatly avoided, the replacement time of