The invention provides a drum-type filtering device. The drum-type filtering device comprises a drum wheel, a filter belt, a driving roller device, a back-flushing device, a soiling solution return
pipe, a detection switch, a scraping device, a residue filter tank, a purified
liquid tank, a brushing roll and a device main body, wherein a soiling solution flows into a cavity of the drum wheel through the soiling solution return
pipe, liquid is filtered by virtue of the filter belt and flows into the purified
liquid tank for being machined by a
machine tool, impurities in the soiling solution are blocked by the filter belt and are continuously settled to form a
filter cake, after the
filter cake is accumulated to a certain thickness on the surface of the filter belt, the filter belt rotatesalong with the driving roller device, and the filter belt with the surface attached with the
filter cake part rotates outwards, so that the cycle use of the filter belt is realized; meanwhile, the device is further provided with the scraping device, a
drying device and the like, so that the filter cake can be removed and dried; and the device has the advantages of good filtering performance, reliability in operation, simple and compact structure, low maintenance cost and the like, and the
cycling filtration can be realized.