The invention relates to a solid waste crushing device. The solid waste crushing device comprises a shell, wherein a feeding hopper is arranged at the top of the shell, the feeding hopper is connectedwith a first fixing plate, the first fixing plate is arranged in 30-45 degrees with the horizontal plane, the first fixing plate is fixed to the inner wall of the shell through a reinforcing rib, thereinforcing rib is connected with a damping rod, the first fixing plate is connected with a second fixing plate, the second fixing plate is arranged in 30 degrees with the horizontal plane, the inclined directions of the first fixing plate and the second fixing plate are opposite, the second fixing plate is fixed to the inner wall of the shell through bolts, a reinforcing plate is fixed between the second fixing plate and the shell, a damping spring is arranged on the reinforcing plate, an inclined plate is arranged at the bottom of the shell, the inclined plate is arranged in 10 degrees withthe horizontal plane, the end, located on the lower side, of the inclined plate is connected with an outlet, the outlet is provided with a valve, the middle of the inclined plate is connected with asupporting shaft perpendicular to the bottom of the shell, a rotating shaft is arranged in the supporting shaft, the rotating shaft is connected with a crushing mechanism and is fixed through a connecting piece, and the other end of the rotating shaft is connected with a fixing device. The solid waste crushing device has high working efficiency, high precision, short crushing time, stability and firmness, good impact resistance effect and long service life.