Cutting type grinding instrument

The utility model discloses a cutting type grinding instrument. The grinding instrument comprises a grinding instrument main body, a grinding cavity, a grinding cavity, a feeding funnel and an underframe, the grinding instrument body is installed on the bottom frame, the feeding hopper is arranged on the grinding cavity, the grinding cavity comprises a fixed cavity body and an overturning cavity body, a grinding cavity is formed between the fixed cavity body and the overturning cavity body, the cutting type grinding instrument overturning cavity body is limited in a pluggable mode, and the grinding cavity is convenient to clean and free of dead corners. The cutting ridges are matched with the rotary knife group to continuously cut samples, so that the cutting efficiency and strength are improved, and energy is saved; the cutting type grinding instrument is further provided with a rotary knife pulling-out tool for unscrewing the rotary knife, the rotary knife can be safely and conveniently disassembled, the st