The utility model relates to a drying device for dust-measuring filter membranes. The drying device comprises a base plate, a vertical shaft, a filter membrane box, a protective sleeve and a filter membrane storage panel, wherein the vertical shaft is fixed in the center of the base plate; the filter membrane box is sleeved on the vertical shaft; the filter membrane storage panel is stored in the filter membrane box; and the base plate, the vertical shaft and the filter membrane box are placed in the protective sleeve. The dust-measuring filter membranes are fixed on the drying device to be dried, so that pollution to the filter membranes, caused by a drier, and cross contamination of the filter membranes, are avoided; a filter membrane fixing clamp is used for fixing the filter membranes, so that dust samples collected in the filter membranes are prevented from falling off; the filter membrane storage panel made of metal is adopted to lead static electricity on the filter membranes out, and as a filter membrane static eliminator is not used, dried filter membranes are prevented from being dampened again, and the dust samples collected on the filter membranes are not lost; and as the protective sleeve is adopted, the drying device can be conveniently carried to the site, and as a top cover and a bottom cover are used to seal the filter membrane box, the filter membranes in the filter membrane box are protected against external pollution.