Abstract: A mobile phone and tablet personal computer protective casing with a stand, including a protective casing, a bottom support, a surface support, a supporting plate, a supporting groove, a connecting component, a switch hole and a switch part; the protective casing being provided with a through hole, the bottom support and the surface support; the supporting groove being formed in the surface support; the supporting plate being connected in the supporting groove; the switch hole being formed in the surface support and internally provided with the switch part; the switch part including a pressing member and a spring; and the pressing member being pressed to make the spring telescopic to drive the limitation of the limiting edge, thereby controlling the telescoping of the supporting plate. The problem that the supporting plate and other parts are easily damaged due to non-mechanized telescopic reset of the supporting plate is solved.