Infinite ball slide rail capable of realizing random extension lengths

The invention relates to an infinite ball slide rail capable of realizing random extension lengths. The current three-section ball slide rail is changed from a structure of an outer layer slide rail, a middle layer slide rail and an inner layer slide rail to a structure of an outer side slide rail, a middle slide rail and an inner side slide rail, wherein the center distances of balls in an upper slide rail and a lower slide rail which are formed by the outer side slide rail, the middle slide rail and the inner side slide rail, thus persons can infinitely regulate the number of layers of middle slide rails according to practical requirements to realize random extension lengths. Under the condition that the widths of the slide rails are equal, the bearing capability of the three-section ball slide rail disclosed by the invention is greatly improved as compared with the bearing capability of the current three-section ball slide rail. The self width of each layer slide rail in the structure of the infinite ball slide rail is larger and spaces among the three layer of slide rails are also larger, thus the invention further provides a structure platform so as to design a novel structure and a product capable of acting various specific additional movements along with the extension or retraction of the ball slide rails. Therefore, the invention develops a fully novel product series, besides the current full-extension three-section ball slide rails.