Waste stone crushing device for building

The utility model discloses a waste stone crushing device for construction, which is applied to the field of waste stone processing, and is characterized in that a crushing mechanism comprises a driving motor, a rotating shaft fixedly connected with the driving motor through a coupler, and a bottom block rotationally connected with the outer wall of the rotating shaft through a bearing I; the waste stone crushing device has the technical effects that the crushing cutter on the rotating shaft is driven by the driving motor to crush waste stone, kinetic energy on the rotating shaft is transmitted to the bottom block through transmission of the driving gear, the driven gear, the inner gear and the cylindrical block, and the bottom block and the crushing cutter are opposite in rotating direction; centrifugal force generated by opposite rotation of the bottom blocks not only separates the crushed stones out of round holes in the sieve plate, but also can accelerate the stone crushing efficiency through opposite ro