The invention relates to the technical field of chemistry engineering, and discloses a grinding device for chemical powdery raw materials. The grinding device comprises a fixed baseboard, wherein a grinding frame is installed in the middle of the upper end of the fixed baseboard, supporting frames are installed at the two sides of the upper end of the fixed baseboard, a fixed gear is installed between the top ends of the supporting frames, a grinding gear is meshed with the front end of the fixed rack, a grinding shaft is installed in the middle of the lower end of the grinding gear, a grinding disc is connected to the bottom end of the grinding shaft, and a plurality of grinding wheels are arranged in the middle of the bottom end of the grinding disc. A bearing cylinder is installed in the middle of the grinding shaft, a movement block is installed at the outer side of the bearing cylinder, a threaded part of a driving shaft is connected to the middle of the rear end of the movement block, the right end of the driving shaft penetrates through the supporting frames to be connected with a driving gear, a lifting rack is meshed with the rear end of the driving gear, and the bottom end of the lifting rack is provided with a reciprocating mechanism. By means of the grinding device, through the mutual cooperation of the reciprocating mechanism, the lifting rack and the driving gear,reciprocating rotation of the driving shaft is achieved, through the mutual cooperation of the movement block, the grinding shaft and the grinding gear, the grinding disc carries out reciprocating rotation while reciprocating left and right, and the grinding effect on the chemical powdery raw materials is enhanced.