The invention discloses a fodder grinder of an improved screening structure. The fodder grinder comprises a grinding box, a screening box and a base; the grinding box is arranged on the top of the screening box, the base is arranged below the screening box, a grinding shaft is arranged in the middle of the inner side of the grinding box, a grinding motor connected with the grinding shaft is arranged on the top of the grinding box, a plurality of rotating tool teeth are mounted at the position, on the inner side of the grinding box, on the grinding shaft, a plurality of fixed tool teeth are arranged on the inner side wall of the grinding box, a scraping plate is arranged at the position, located at the bottom of the inner side of the grinding box, on the grinding shaft, a screening plate is arranged on the inner side of the screening box, the middle of the upper side of the screening plate is connected with an electric telescopic rod through a second supporting spring, a vibration motor is arranged in the middle of the lower side of the screening plate, multiple first supporting springs are arranged on the outer ring of the screening plate, and a receiving plate is arranged below the screening plate. The fodder grinder is good in fodder grinding and screening effect, and novel in structure and has the very high popularization and utilization value.