A screen repair patch and a screen flaw repair method. The screen repair patch includes an optical layer, a substrate layer, and an adhesion layer. The optical layer and a screen to be repaired have the same or similar optical performance. The substrate layer has a thickness of 10 to 250 microns. The adhesion layer has a thickness of 5 to 200 microns. In the screen flaw repair method, a repair patch is cut off from a region on a patch sheet corresponding to the position of a flaw of a screen, and the repair patch is attached to the corresponding position of the flaw of the screen by using a joining direction of the screen as an affixing direction of the repair patch. The screen repair patch and the screen flaw repair method of the present disclosure uses a patch that can be easily affixed and removed and can repair a flaw on site to maintain original optical efficiency and uniformity of a screen and are applied to a polarization-preserving screen to maintain high polarization contrast, so as to extend the service life of the screen.