Molding sand recovery device for casting

The invention provides a casting molding sand recovery device which comprises a grinding box, a first feeding port is formed in the top end of the grinding box, a grinding assembly is arranged in the grinding box, the bottom of the grinding assembly is connected with a filtering box, and the filtering box is connected to a conveying cylinder through a first connecting pipe; a rubbing assembly is arranged on one side of the filtering box and communicates with the conveying cylinder through a second connecting pipe, a rolling assembly is arranged on one side of the rubbing assembly and communicates with the conveying cylinder through a third connecting pipe, and a fourth driving motor is connected to the side wall of one end of the conveying cylinder; the end, extending into the conveying cylinder, of the fourth driving motor is connected with a rotating rod. The molding sand is crushed and filtered for multiple times through the rolling assembly, the expanding assembly and the rolling assembly, the molding san