The invention relates to a smashing device which comprises a rack, a driving smashing shaft, a driven smashing shaft, smashing teeth and a protective cover. Mounting base lugs are arranged on the rack. The driving smashing shaft is mounted on the protective cover. A driving gear is mounted at one end of the driving smashing shaft. A belt pulley is mounted at the other end of the driving smashing shaft. The driven smashing shaft is located on one side of the driving smashing shaft and mounted on the protective cover. A driven gear is mounted at one end of the driven smashing shaft and meshed with the driving gear. The smashing device has the advantages of being reasonable in structural design, low in cost, high in working efficiency and the like, can achieve rapid sorting of straw, and is convenient to operate and safe in use.