The invention discloses a xylanase mutant with improved catalytic efficiency, and belongs to the technical field of genetic engineering and protein expression. A molecular structure of xylanase is modified by site-specific mutagenesis and saturation mutation biological technologies to obtain a xylanase mutant AEx11AT98D/V124Q with improved catalytic activity. The specific activity and catalytic efficiency of mutate enzyme are separately 3.04 times and 3.74 times that of AEx11A, and moreover, the high temperature resistance and high thermal stability of the enzyme are still similar to those ofproenzyme. The limited problem of low catalytic activity of the xylanase is solved, the xylanase mutant with the improved catalytic efficiency has high application potential, and a theoretical basis is laid for research of the xylanase.