Mechanical biological pretreatment device for household garbage

The utility model discloses a household garbage mechanical biological pretreatment device which comprises a crushing kettle, a first motor is installed at the top end of the crushing kettle, an output shaft of the first motor is connected with a rotating shaft through a coupler, transverse crushing blades are installed on the rotating shaft, and the inner wall of the crushing kettle is rotationally connected with a short shaft through a bearing. The utility model relates to the technical field of household garbage disposal, the longitudinal crushing blades are arranged at the positions close to the inner wall of the crushing kettle, garbage thrown to the inner wall of the crushing kettle by centrifugal force can be crushed by the longitudinal crushing blades, and the garbage can be crushed by the transverse crushing blades. The situation that garbage on the inner wall of the crushing kettle cannot be crushed or is not fully crushed is avoided, so that the garbage is thoroughly crushed; and the spiral blades a