A slide rail assembly includes a first rail, a second rail, a bracket and a supporting base. The first rail defines a first passage along a first direction. The second rail is movably connected to the first rail and is movable relative to the first rail in the first passage. The bracket is connected to an end of the first rail. The supporting base is movably arranged on the bracket and is movable along the first direction relative to the bracket. The supporting base includes a first supporting portion defining a supporting passage corresponding to the first passage, and the supporting base is configured to allow the second rail to move into the supporting passage.