Novel green building material-biological cement preparation method

The invention relates to a novel green building material-biological cement preparation method. The method comprises the following steps: 1) using agriculture waste for acid production and fermentation; 2) dissolving calcium carbonate crystal in waste from a mining industry by acetic acid through acid production and fermentation to obtain a calcium acetate solution; 3) producing methanogenesis biomass; and 4) mixing the calcium acetate solution and the methanogenesis biomass to prepare the biological cement. The method uses the agriculture waste and waste from the mining industry to obtain the solution rich in calcium ions, and the solution is mixed with the methanogenesis biomass with certain proportion to prepare the biological cement with low cost. The environment friendly green building material has the advantages of safety, low cost and no harm on environment.