Building material grinding machine

The utility model discloses a building material grinding machine, which belongs to the technical field of building material grinding and comprises a grinding kettle, a main rotating shaft is rotatably connected in the grinding kettle through a bearing, a grinding component is fixedly connected to the outer surface of the main rotating shaft, and supporting legs are fixedly connected to the periphery of the bottom of the grinding kettle. And a screening assembly is arranged among the four supporting legs, the grinding assembly comprises a connecting rod, the connecting rod is connected with the outer surface of the main rotating shaft in a clamped mode, and the two ends of the connecting rod are rotationally connected with auxiliary rotating shafts through bearings. According to the building material screening device, through the arrangement of the screening assembly, ground building materials are discharged from the discharging pipe and fall into the screening basket, in the engineering, the motor drives the