The invention discloses an automatic waste treatment device. The automatic waste treatment device comprises an outer housing, a feeding part, a conveying part and a crushing part, wherein the outer housing is a rectangular housing with upper and lower openings; the feeding part comprises a feeding barrel, opening and closing modules and a first driving module; the conveying part comprises a slideframe, a spring, an extrusion roller and a first motor; and the crushing part comprises a tooth roller and a second driving module. Through alternate opening and closing of upper and lower two sets ofopening and closing modules, all crushing work after wastes enter the feeding barrel can be finished inside, so that the excessive materials are prevented from splashing, and the safety is high; in addition, the wastes are extruded by the extrusion roller and crushed by the tooth roller; the extrusion roller can extrude the shapes of the wastes to a size suitable for crushing by the tooth roller,so that the crushing efficiency is high, and the crushing effect is good; through the effect of the spring, the extrusion roller has a certain elastic extension space to prevent damage of a machine caused by rigid extrusion; and the automatic waste treatment device is simple in overall operation and high in automation degree.