NOVELTY - An ethanol is produced by pre-treating crop wastes by acid and alkali; and treating with hydrochloric acid, sulfuric acid, phosphoric acid, lime and/or ammonia, where pre-stage mixes materials and concentrated acid or alkali, and middle stage eliminates harmful compounds at 105-110 degrees C for 1 hour.    USE - Method of producing ethanol (claimed).    DETAILED DESCRIPTION - Ethanol production involves:    (A) pre-treating crop wastes by acid and alkali;    (B) treating hydrochloric acid, sulfuric acid, phosphoric acid, lime and/or ammonia, where pre-stage mixes materials and concentrated acid or alkali, the middle stage eliminates harmful compounds, where concentration of hydrochloric acid, sulfuric acid, phosphoric acid, and/or volatile organic acid is 0.05-0.1% at 105-110 degrees C for 1 hour;    (C) eliminating liquid from pre-stage, in post treatment, using hydrochloric acid, sulfuric acid, and/or phosphoric acid whose concentration is 0.8-1% at 105-125 degrees C for 2-4 hours; or in middle and post treatments, using weak alkali having 0.1-5% sodium hydroxide, lime, and/or ammonia at 105-125 degrees C for 2-4 hours;    (D) treating by volatile organic acid, e.g. formic acid, acetic acid or trichloroacetic acid, in middle stage, eliminating harmful compounds, where concentration of volatile organic acid is 0.05-0.1% at 100-110 degrees C for 1 hour;    (E) eliminating liquid from pre-stage, where concentration of treating liquid for post stage is 0.8-1% at 100-110 degrees C for 2-4 hours, heating to 118-125 degrees C to recycling organic acid;    (F) separating dregs, washing, discharging by compressed air, evaporating the treated solution in vacuum until its concentration is 20%, pumping it to film evaporator, and sending the evaporated solution to crystallization pot;    (G) adding cellulase and cellobiase in the dregs, hydrolyzing at 40-60 degrees C for 12-24 hours at pH of 4-5;    (H) fermenting the hydrolyzed material for saccharification during hydrolyzing to produce ethanol; and    (I) distilling the fermented material.