The invention relates to a method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide, which belongs to the field of chemical engineering. The method comprises the following steps of: carrying out dissolving pre-treatment for 0.5 hour-2 hours on corn stalks at 90 DEG C-120 DEG C in an NMMO (Oxide Morpholine)-diluted hydrochloric acid-water pre-treatment system; adding deionized water to wash and regenerate to obtain a cellulose material; washing the regenerated cellulose material by the deionized water by three times, adding an acetic acid-sodium acetate buffer solution to form a mixed system; and carrying out enzymolysis by using cellulose, and carrying out an oscillatory reaction on a constant-temperature shaking table with the speed of 180 rpm at 50 DEG C to achieve the enzymolysis purpose of corn stalks. According to the method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide disclosed by the invention, the diluted hydrochloric acid auxiliary oxide morpholine-N-oxide is utilized to pre-treat the corn stalks, so that the high-value utilization of the corn stalks is realized, and the reducing sugar yield is bigger than 60%. The method for pre-treating corn stalks by diluted hydrochloric acid auxiliary oxide morpholine-N-oxide has the advantages of being simple in process, high in efficiency, economical in process, less in the three wastes, and the like.