The adsorption kinetics of cellulase and xylanase immobilized on magnetically separable, hierarchically ordered mesocellular mesoporous silica (M‐HMMS) was investigated. The adsorption of cellulase on M‐HMMS followed pseudo‐second‐order kinetics while the xylanase adsorption followed the Avrami model. Intraparticle and film diffusion also affected this process. These results enable in‐depth knowledge of the cellulase and xylanase adsorption mechanisms on M‐HMMS for better future applications by improving the stability of the immobilization. Cellulase and xylanase were co‐immobilized in magnetically separable hierarchically ordered mesocellular mesoporous magnetic silica (M‐HMMS) through adsorption. The adsorption mechanism was investigated. Cellulase and xylanase adsorption took place on the external surface and inside the pores of M‐HMMS.