NOVELTY - Treating methylene blue dye-wastewater comprises transferring high-strength diatomite-based porous adsorbent into a conical flask containing liquid culture medium, adding yeast powder and culturing to obtain yeast loaded-diatomite-based porous adsorbent, adding yeast loaded-diatomite-based porous adsorbent into methylene blue dye wastewater, adjusting pH to 4-10, treating by placing on a shaker and stirring at 60-120 rotations/minute, measuring the concentration of methylene blue dye-wastewater using spectrophotometer to obtain a result showing methylene blue removal rate of more than 90%.    USE - The method is useful for treating methylene blue dye-wastewater (claimed).    ADVANTAGE - The method is simple and economical, does not cause secondary pollution, and is suitable for industrial methylene blue dye-wastewater processing.    DETAILED DESCRIPTION - Treating methylene blue dye-wastewater comprises: (i) grinding commercially available diatomite, sieving by 80-meshes sieve and drying, then adding calcareous material, alkali activator and water into dried diatomite, mixing uniformly, press-molding under a pressure of 5-40 MPa to obtain molded sample, reacting the molded sample in a high-pressure hydro-thermal reactor at 100-200 degrees C for 1-48 hours to obtain high-strength diatomite-based porous adsorbent, detecting the anti-hydraulic shearing effect of adsorbent, where the amount of calcareous material, alkali activator and water is 10-50 wt.%, 10-20 wt.% or 5-50 wt.% to the mass of diatomite, the calcareous material includes slaked lime, limestone, calcined lime, dolomite and/or anorthite, the alkali activator includes sodium hydroxide, sodium meta aluminate, sodium silicate, sodium metasilicate and/or fly ash; (ii) transferring the high-strength diatomite-based porous adsorbent into a conical flask containing liquid culture medium, adding 5-20 wt.% yeast powder (commercially available bread yeast powder or commercially available dye wastewater treatment yeast), adjusting pH to 5-8, culturing at 15-35 degrees C for 2-48 hours by placing on a shaker under stirring condition of 60-120 rotations/minute to obtain yeast loaded-diatomite-based porous adsorbent; and (iii) adding 1-10 g yeast loaded-diatomite-based porous adsorbent into 100-1000 mg/l concentration of methylene blue dye wastewater, adjusting pH to 4-10, treating at 25-45 degrees C for 1-48 hours by placing on a shaker and stirring at 60-120 rotations/minute, measuring the concentration of methylene blue dye-wastewater using spectrophotometer to obtain a result showing methylene blue removal rate of more than 90% with dye adsorption amount of more than 80 mg/g.