The invention discloses a mixed material sorting device and a control system thereof, relates to the technical field of material sorting devices. The device solves the technical problem that materialsin different sizes cannot be sorted at the same time through a material sorting machine in the prior art. The mixed material sorting device comprises a material bin, limiting mechanisms and a conveying mechanism, wherein the material bin comprises a plurality of material bin bodies with different sizes and specifications, the limiting mechanisms correspond to the material bin bodies, and the limiting mechanisms correspondingly control materials in the corresponding material bin bodies to fall into the conveying mechanism. According to the sorting device, the plurality of material bin bodies with different sizes and specifications are arranged, so that the sorting machine can simultaneously contain materials with different sizes and specifications, the purpose of conveying the materials with different sizes and specifications on the same sorting machine is realized, so that various types of sorting machines in the prior art are integrated into one sorting machine, the labor cost is saved, and meanwhile the occupied space of the material sorting machine is reduced.