NOVELTY - Combined method for preparing biomass carbon reducing agent and producing industrial silicon, comprises using waste heat of high-temperature smoke during production of industrial silicon for supplying heat source for pyrolyzing biomass, sieving, molding and drying the biomass; carrying out destructive distillation and pyrolysis, where the solid product is biomass carbon capable of serving as reducing agent for producing industrial silicon; treating the pyrolyzed gas; and pre-drying the biomass with waste heat of pyrolyzed gas during pyrolysis.    USE - Combined method for preparing biomass carbon reducing agent and producing industrial silicon.    ADVANTAGE - The waste heat of high-temperature smoke during production of industrial silicon supplies heat source for pyrolyzing biomass, at the same time, the biomass carbon produced by pyrolyzing biomass serves as reducing agent for producing industrial silicon. Thus, reducing the energy consumption and the cost in producing industrial silicon, and reducing the emission. The technical process takes biomass as raw material for producing reducing agent and other product, since the biomass can be regenerated.    DETAILED DESCRIPTION - Combined method for preparing biomass carbon reducing agent and producing industrial silicon, comprises:    (A) using waste heat of high-temperature smoke during production of industrial silicon for supplying heat source for pyrolyzing biomass, sieving, molding and drying the biomass;    (B) then introducing into a pyrolysis furnace to carry out destructive distillation and pyrolysis, where the pyrolyzed liquid product is wood tar and wood acetic acid, and the solid product is biomass carbon capable of serving as reducing agent for producing industrial silicon;    (C) treating the pyrolyzed gas via a purifying technique for producing chemical industrial product, which is methanol; and    (D) pre-drying the biomass with waste heat of pyrolyzed gas during pyrolysis so as to recycle the heat energy in pyrolyzed gas and reduce the temperature.    DESCRIPTION OF DRAWING(S) - The drawing is a block diagram of method for preparing biomass carbon reducing agent and producing industrial silicon (Drawing includes non-English language text).