Abstract: Sliding track assembly is provided. A sliding track assembly includes a first rail, a second rail reciprocally moved with respect to the first rail, a third rail reciprocally moved with respect to the second rail, and a latch mechanism disposed on the second rail. The first rail has a retaining block, and the third rail has a protrusion. The latch mechanism includes a pair of swing arms engaged against the retaining block. When the latch mechanism is forced by the protrusion, the pair of swing arms is swung outwardly and disengaged from the retaining block.