The invention discloses a screening machine. The screening machine comprises a driving mechanism and a screening drum which is connected with the driving mechanism, wherein the screening drum comprises an outer screening drum body and an inner screen drum body; the inner screen drum body is fixedly arranged in the outer screen drum body; a gap is reserved between the inner screen drum body and the outer screen drum body; a coarse material outlet is formed in one end of the inner screen drum body; a fine material outlet is formed in one end of the outer screen drum body. According to the screening machine, screen meshes with different mesh numbers can be mounted on the inner screen drum body and the outer screen drum body, and the material feeding speed can be controlled, so that materials of different mesh numbers can be screened; the requirement of controlling the materials respectively is also met; the user requirement can be met; continuous feeding and discharging can be realized; the processing amount is large; the work efficiency is high; the production efficiency is improved.