The invention relates to the field of material sorting equipment, in particular to a cast type material separation method and device and a separation bin. The cast type material separation method comprises the steps that at least one collecting area is provided with a screening device, a mixed material is cast through a cast device, the material falling into the collecting area where the screening device is located is screened through the screening device so that the material meeting the grain size requirement can be obtained. Compared with an existing material separation method, according to the cast type material separation method, the mixed material is preliminarily separated through the cast device, the screening device is arranged in the collecting area so as for further screen the material entering the collecting area, the effect that the grain size of the material obtained after screening is in the required range is guaranteed, and the problem that according to an existing cast type material separation method, due to the fact that further screening operation needs to be conducted, the production efficiency is low is solved.