At least one embodiment of the invention describes an inflatable staircase slide assembly that engages with staircases and side rails, and includes an inflatable tubular half-pipe slide member, a compressible support layer, engagement points, ties, at least two elongate straps and at least one blow-up valve. The inflatable tubular half-pipe slide member is placed over the staircase and includes a top portion, a bottom portion, an elongated dipped surface and two sidewalls extending lengthwise from the top portion to bottom portion. The plurality of engagements points are located on each elongate strap of each sidewall, and are coupled to the ties allowing a user to tie the inflatable tubular half-pipe slide member to the side rails at multiple locations for added safety and security. In addition, the compressible support layer is saw-toothed shaped and may be inflatable, padded, or a combination of both.