The invention discloses a building cement waste breaking and cleaning device, and relates to the technical field of building facilities. The device comprises a bottom plate, a breaking box is fixedlyconnected to the top of the bottom plate, a partition plate, a mounting plate and a supporting plate are fixedly connected between the two sides of the inner wall of the breaking box from top to bottom in sequence, a separation plate is arranged between the top of the partition plate and the inner wall of the breaking box, a separation plate is arranged between the bottom of the partition plate and the top of the mounting plate, and a separation plate is arranged between the bottom of the mounting plate and the top of the supporting plate. According to the building cement waste breaking and cleaning device, the breaking effect is greatly enhanced, the breaking efficiency is well improved, building cement can be sufficiently broken, one breaking device can automatically carry out two-time breaking, people do not need to waste a large amount of time for building cement block breaking, work burdens of the people are reduced, and the building cement blocks can be rapidly and efficiently broken.