Quick distachable platform

The invention is a fast removable platform, comprising: supporting framework unit having a pair of supporting frameworks and a pair of inner wall fixing components and comprising inner beam, outer beam, hanging beam fixed between the inner and outer beams, and install piece arranged on the outer beam, where the inner, outer and hanging beams form an inverted U shape, the inner wall fixing component comprises vertical beam and fastener, as assembling, the inner wall fixing component is fixed on the inner wall of a counterfort, the supporting framework is arranged on the counterfort along the two sides of the window frame and the inner beam is inserted in the vertical beam, the outer beam is butted against the outer wall of the counterfort by the fastener of the inner wall fixing component; support unit, having a pair of support frames and hanging fastening piece and railing support piece and hanging on the install piece through the hanging fastening piece to form two extended support arms; platform plate unit spread horizontally on the support arms; railing unit fixed on the railing support piece; and backplate unit arranged inside the railing unit.