Sand mill with pretreatment device

The utility model relates to a sand mill with a pretreatment device, which comprises a working table, a grinding cylinder is arranged on the working table, a feeding pipe and a medium feeding pipe are arranged on the grinding cylinder, a grinding shaft is rotatably connected in the grinding cylinder, a grinding disc is arranged on the grinding shaft, and a first motor for driving the grinding shaft to rotate is arranged on the working table. One end of the grinding barrel is connected with a discharging barrel, a first filter screen is arranged between the grinding barrel and the discharging barrel, a discharging pipe is arranged on the discharging barrel, a pretreatment barrel is arranged on one side of the grinding barrel, a feeding pipe is arranged on the pretreatment barrel, the feeding pipe is connected with a feeding pipe through a pneumatic diaphragm pump, a feeding hopper is arranged on the pretreatment barrel, and a second filter screen is arranged in the feeding hopper. The sand mill has the effect