A laptop PC stand is disclosed, comprising: a carrier unit, an extension unit and a rotation support unit; the carrier unit and the extension unit being arranged side by side to form a platform carrying a laptop PC, the carrier unit having a placement surface with a partial area concave and forming a housing space, and a first side and a second side; the extension unit being adjacent to the second side, being disposed with a plurality of tracks extending into the carrier unit, and disposed with at least a stop block, the stop block standing on the extension unit when flipped; the rotation support unit coupled to the first side, and after rotation, being located inside the housing space or standing on the first side; the rotation support unit having a first clamping element and a second clamping element, able to move towards the same or opposite direction.