The tooth roller is the main component of mineral sizers. The existing tooth roller drum and wheel hub are generally cast in one body, and then through the wheel hub and drive shaft set to achieve transmission, but the drum and wheel hub casting structure is complex, difficult to process. At present, there are also instances of processing the wheel hub and the drum separately, but the matching surface of the two is a cone, and the two ends of the wheel hub are pulled tight by bolts, the cone is required to meet high requirements, not easy to process, and the bolts to achieve the connection are also prone to deformation and failure, and the reliability is not high. This design provides a split toothed roller for mineral sizers with simple structure, high reliability in processing. The following technical scheme is adopted to achieve the above purposes: a split tooth roller for mineral sizers comprises a drive shaft, a wheel hub fitted on the drive shaft and a roller with broken teeth distributed on the outer circular surface. The wheel hub and the roller are of a split structure, the matching surface of the two is a cylinder, and the wheel hub and the roller are connected by a connecting piece. The roller is an integral structure of the whole casting. The hub and drum fit are connected together by connecting pins and connecting bolts respectively. Compared with the existing toothed roller, the invention has the advantages of simple structure, high reliability in processing, the cylinder and the wheel hub are fitted, the connecting pin and the connecting bolt are connected and fixed at the same time, and the service life is long.