Vacuum grinding machine

The utility model discloses a vacuum grinder which comprises a main machine and a bean box, a grinding mechanism and a vacuumizing mechanism are arranged in the main machine, the grinding mechanism is provided with a grinding cavity, a bean box seat is arranged at the top of the grinding cavity, the bean box comprises a bean box body and a cover body, and a storage chamber is arranged in the bean box body; a blanking channel communicated with the grinding cavity is arranged at the bottom of the storage chamber, and a blanking valve used for controlling the blanking channel to be opened and closed is arranged in the blanking channel; an air exhaust channel is arranged in the circumferential direction of the discharging channel in a surrounding mode and abuts against the top face of the main machine, the two ends of the air exhaust channel communicate with the material storage chamber and the vacuumizing mechanism correspondingly, and a first one-way valve is arranged in the air exhaust channel. And the first o