The invention relates to a dust protective mask, which is mainly applied to industrial fields. The dust protective mask provided by the invention comprises a three-dimensional filter main body, and athree-dimensional orthosis apparatus which is arranged in the three-dimensional filter main body in accordance with a detachable mode. Specifically, the orthosis apparatus comprises a supporting bodyand a nose bridge squeezing tool, wherein the supporting body is constituted by a non-woven fabric which is harder than the filter main body in material quality and has a loose air-permeable texture structure to absorb water generated from user's breathing; the nose bridge squeezing tool is transversely attached to the upper end of the outer side of the supporting body; the nose bridge squeezing tool is covered by the filter main body; and the nose bridge squeezing tool can undergo bending adjusting. According to the dust protective mask provided by the invention, fitting force of the nose part of a user can be improved, and the water generated from breathing can be processed easily.