The present invention relates to a mutant beta-glucosidase derived from Neosatolya fichei with improved activity and its use. The mutant beta-glucosidase derived from Neosatolya fichei with improved activity according to the present invention is a mutant beta-glucosidase derived from Neosatolya ficusieri which mutates an important moiety in the activity of beta-glucosidase derived from Neosatolya fischeri, , And a mutant beta-glucosidase derived from Neosatolia fichei with improved activity can be used to efficiently saccharify a substrate.
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