The invention relates to a material crushing magnetic separator. The material crushing magnetic separator comprises a bottom seat, wherein a feeding cavity is formed in the left side of the upper portion of the bottom seat, a left lifting cavity is connected with the right side of the feeding cavity, a feeding pipe is connected with the upper portion of the right side of the left lifting cavity, a crushing cavity is connected with the right side of the feeding cavity, a return pipe is connected with the lower portion of the left side of the crushing cavity, a filter plate is arranged on the lower portion of the crushing cavity, a stirring cavity is formed in the lower portion of the filter plate, a blanking pipe is connected with the right side of the stirring cavity, a right lifting cavity is connected with the right side of the blanking pipe, a discharging cavity is connected with the upper portion of the right side of the right lifting cavity, a plurality of discharging holes are formed in the lower portion of the discharging cavity, a feeding cavity is located on the lower portion of each discharging hole, and separation cavities are arranged on the lower portions of the feeding cavities. The material crushing magnetic separator can effectively perform crushing treatment on materials, facilities lifting treatment after the materials are crushed, improves crushing treatment effects of the materials, facilitates drying treatment, performs magnetic separation after the materials are crushed more than once, conveniently separates out impurities, facilitates counting of the quantity of the impurities, improves separation treatment effects of the impurities, and is convenient to use.