The invention belongs to the field of a functional clothing material, and relates to a graystone-fiber-based firefighter uniform material and a preparation method. The clothing material comprises the following raw materials, by weight part: chitosan, graystone fiber, water-soluble ammonium polyphosphate, a hydrogen-contained silicone oil emulsion, hydrogen-contained polyether modified polysiloxane, an antibacterial finishing agent of quaternized organosiloxane, ceramic fiber, anionic plant dye, PBI fiber, Prylanitz fiber, Qutlast acrylic fiber, carbon fiber, acidic formaldehyde, an azoic cross-linking agent, a sodium hydroxide solution, and a neutral poly ionic liquid. According to the invention, by adopting graystone fiber, insulation property, high and low temperature resistance, and heat-insulating property of the materials is effectively improved; by adopting the organosiloxane finishing agent, water-resisting property, high temperature resistance, and antibacterial property of the material is enhanced; and chitosan and the anionic plant dye can adsorb each other to increase the dying efficiency and to promote the dye to diffuse into the fiber. The graystone-fiber-based firefighter uniform material can satisfy the use of a fashion and high-performance firefighter uniform.