The invention discloses a cleaning machine. The cleaning machine comprises: a conveying device for driving a target piece to move in a preset path, wherein a feed port is formed in one end of the preset path, and a discharge port is formed in the other end; a feed device for feeding the target piece into the feed port; a discharge device for taking the target piece out of the discharge port; and a cleaning device arranged in the preset path and used for cleaning the target piece on the preset path. In the whole process, manual intervention is canceled, and the taking and the placement are both realized through specific devices, so that in whole cleaning of the target piece, the secondary manual pollution of the target piece can be effectively prevented, the disqualification of part cleaning effects caused by manual operation is reduced, and the expensive labor cost is prevented. The cleaning machine can effectively solve such problems as difficult charging barrel cleaning, high cost and bad effect.