The invention belongs to the field of numerical control machine tools and discloses a property assessing method based on instruction domain analyzing and of a numerical control machine tool magazine. The method comprises the following steps that (a), pre-set parameters are input to generate a machining instruction; (b), total data of the machine tool is collected through a numerical control system; (c), through an instruction domain analyzing method, a property index of the tool magazine is obtained through calculation; and (d), the property index of the tool magazine is compared with a pre-set property standard, and different assessed results are stored and displayed. According to the property assessing method based on instruction domain analyzing and of the numerical control machine tool magazine, the data are directly collected through the numerical control system, additional hardware devices for datum collecting and transmitting are not needed, normal machining is not affected, deep excavating, efficient using and low cost of a numerical control machine tool instruction sequence are achieved, and the reliable level of the tool magazine is improved.