The invention discloses a bearing buffering bottom mounting sliding rail. The bearing buffering bottom mounting sliding rail comprises fixed rails and movable rails which are matched with each other, pulleys and guide grooves matched with pulleys, buffers are arranged on the fixed rails, each buffer comprises a support I, a support II, a damper and a clutch device, each clutch device comprises a clutch component I and a clutch component II, each clutch component I is arranged on the lower portion of one side of the corresponding support I, the top of each fixed rail is provided with a groove of which the width is matched with that of the corresponding clutch component I, the lower portion of the clutch component appears out of the bottom of the corresponding support I and is clamped in the groove at the top of the corresponding fixed rail, and each clutch component II is arranged on the top of one side of the corresponding movable rail which matched with the corresponding fixed rail; each damper is arranged on one side inside the corresponding support II, the other side of the support II is provided with a tension spring, and the two ends of each tension spring are fixed on the upper portion of the corresponding support I and the upper portion of the corresponding support II. According to the bearing buffering bottom mounting sliding rail, the problems that a traditional bottom mounting sliding rail does not have a buffer function, and the noise is big are solved, the structure is simple, installation is convenient, self-locking and buffer functions are achieved, operation is stable, gentle and quiet, the cost is low, and batched production is achieved.