The invention relates to the field of industrial equipment, in particular to a screening machine. The screening machine comprises a discharging funnel, wherein a discharging opening of the dischargingfunnel is connected with a feeding opening of a storage box, and a discharging pipe is arranged at the bottom part of the storage box; an inclined groove is formed under the discharging pipe, the inclined groove is connected with a screening groove, and a discharging end of the screening groove is connected with a feeding end of a conveying groove; and a material receiving cylinder is arranged atthe lower end of a discharging hole of the conveying groove. According to the screening machine, soybeans enter the storage box along the discharging funnel, enter the inclined groove through the discharging pipe at the bottom part of the storage box and flow downwards along the inclined groove to enter the screening groove, and after screening and removing impurities mixed in the soybeans, the soybeans enter the material receiving cylinder along the conveying groove; the screening machine has the advantages that the whole production process does not need manual operation, production efficiency is high, and the purpose of automatically screening the soybeans is achieved.