The invention discloses a disposer for domestic garbage. The disposer comprises a base and a box body, wherein the base is provided with a motor; a rotating shaft of the motor is provided with a circular shaft; the circular shaft is provided with a first bevel gear and a first magnet; the first magnet comprises a disc part and lug bosses which are symmetrically arranged along the centerline of thedisc part; the base is also provided with a fixed arm fixedly connected with the box body; the box body is provided with a feeding hole and a discharge hole; the box body is rotationally connected with a supporting shaft; the supporting shaft is provided with a linkage disc and a second bevel gear; the linkage disc is equidistantly provided with a plurality of crushing blocks and telescoping mechanisms for crushing the garbage in the circumferential direction; two sides in the box body are both provided with guide grooves and limiting holes; further, elastic iron sheets are connected into theguide grooves in a sliding manner; certain ends, which are far away from the first magnet, of the elastic iron sheets are provided with second permanent magnets; a filter screen inclined towards thedischarge hole is arranged in the box body; further, the filter screen is located below the supporting shaft. According to the scheme, the problem that a current crusher cannot be used for realizing the solid-liquid separation of the domestic garbage is mainly solved.