The invention discloses a garbage pretreatment device. The garbage pretreatment device comprises a device main body, a collecting device arranged in the device main body, a flattening device arrangedin the device main body, and a storage device arranged in the device main body. The collecting device comprises a first motor fixedly arranged in the device main body, a first cavity is arranged at the left side of the first motor and positioned in the device main body, and a second cavity is arranged at the right side of the first motor and positioned in the device main body. The left end and theright end of the first motor are in power fit connection with a first rotation shaft. The left end of the first rotation shaft extends into the first cavity and is in rotation fit connection in the inner wall of the left side of the first cavity through a bearing. The part, in the first cavity, of the first rotation shaft is in stationery fit connection with a first cam. The device is simple in structure and convenient to use, the work of compressing ring-pull can into blocks can be automatically conducted, safety and environment friendliness are achieved, and the garbage pretreatment deviceis worthy of being recommended.