The invention discloses a cement smashing device comprising a first cross plate and bases fixedly connected with the lower surface of the first cross plate. A damping device is installed on the uppersurface of the first cross plate. According to the cement smashing device, by means of mutual cooperation of vertical rods, first half-ring gears, first tooth plates, second cross plates, first springs, L-shaped plates and other structures, the vibration amplitude can be lowered when the cement smashing device works, so that the service life of the cement smashing device is prolonged. By means ofmutual cooperation of a second motor, a second half-ring gear, a second toothed plate, a second spring, a pipe and other structures, a material blockage phenomenon is avoided, the work efficiency is improved and the labor cost is reduced; by means of mutual cooperation of a filtering net, a third cross plate, a pipe, a fan, the first cross plate and other structures, dust generated during smashingcan be sucked for centralized treatment, and therefore the health of operation personnel is protected.