The enzymatic lignocellulosic biomass conversion into value-added products requires the use of enzyme-rich cocktails, including beta-glucosidases that hydrolyze cellobiose and cellooligosaccharides to glucose. During hydrolysis occurs accumulation of monomers causing inhibition of some enzymes; thus, glucose/xylose tolerant beta-glucosidases could overcome this drawback. The search of new tolerant enzymes showing additional properties, such as high activity, wide-pH range, and thermal stability is very relevant to improve the bioprocess. We describe a novel beta-glucosidase GH1 from the thermophilic Anoxybacillus thermarum (BgAt), which stood out by the robustness combination of great glucose/xylose tolerance, thermal stability, and high Vmax. The recombinant his-tagged-BgAt was overexpressed in Escherichia coli, was purified in one step, showed a high glucose/xylose tolerance, and activity stimulation (presence of 0.4 M glucose/1.0 M xylose). The optimal activity was at 65 degrees C - pH 7.0. BgAt presented an extraordinary temperature stability (48 h - 50 degrees C), and pH stability (5.5-8.0). The novel enzyme showed outstanding Vmax values compared to other beta-glucosidases. Using p-nitrophenyl-beta-D-glucopyranoside as substrate the values were Vmax (7614 U/mg), and KM (0.360 mM). These values suffer a displacement in Vmax to 14,026 U/mg (glucose), 14,886 U/mg (xylose), and KM 0.877 mM (glucose), and 1.410 mM (xylose).