The invention relates to a mounting structure for quickly mounting a steel-ball slide rail for a drawer. The mounting structure comprises the steel-ball slide rail, a support component and a drawer side plate, and is characterized in that the support component comprises a steel-ball slide rail connecting portion, outer connecting portions and arc height portions, and the steel-ball slide rail connecting portion, the outer connecting portions and the arc height portions are integrally manufactured; the support component corresponds to an arc height of the drawer side plate; the steel-ball slide rail connecting portion is of a planar structure, and first connecting holes for being connected with the steel-ball slide rail are formed in the steel-ball slide rail connecting portion; second connecting holes for being connected with the drawer side plate are formed in the outer connecting portions. The mounting structure has the advantages that difficult problems which trouble production can be solved by a support structure of the support component, accordingly, the machining efficiency can be improved to a great extent, and the cost can be lowered; two support components are applied to each steel-ball slide rail, the mounting structure is applicable to products with different depths, and accordingly the problem that the length, width and thickness dimensions of wooden slide rail base plates need to be changed along with products can be solved; variables of the support component in the length direction are changed into constant values, only the arc height dimensions are changed along with the products, and accordingly the specification varieties of components can be reduced to a great extent.