The utility model discloses a coffee residue purification device which comprises a rectification tank, a frame body is arranged above the rectification tank, a supporting rod is fixedly installed below the frame body, the lower end of the supporting rod is matched with the upper end of the rectification tank in a concave-convex mode, a
grinding assembly is installed in the upper end of the frame body, and a
grinding wheel is installed in the upper end of the frame body. The lower end of the frame body is fixedly connected with a filter
cartridge; a bearing
assembly is installed at the lower end of the filter
cartridge in a threaded mode, a plurality of filter plates are fixedly installed in the filter
cartridge at equal angles, a bottom plate is fixedly installed between the bottoms of the filter plates, a driving mechanism is installed at the upper end of the bottom plate, and meanwhile the driving mechanism is sleeved with an
extrusion assembly; the driving mechanism is used for driving the
extrusion assembly to rotate forwards and backwards. According to the coffee residue purification device, after coffee residues are finely ground through the
grinding assembly, the coffee residues are efficiently filtered through the
extrusion assembly, and the extraction effect of subsequent extraction equipment on the coffee residues is improved.