A slide braking apparatus installed on a slide in a cabinet, and the slide sequentially installs a bottom rail, a middle rail and an inner rail. The braking apparatus is disposed between the middle rail and the inner rail. A hook and a control handle for controlling the hook to turn are installed on a surface of the inner rail corresponding to the middle rail. A guide bump is disposed on a surface of the middle rail. The front end of the guide bump has a guide plane for guiding the hook to turn, so that when the hook is turned back to resume its original position, the hook presses precisely at the rear end of the guide bump to limit the inner rail from sliding into the middle rail.