The invention provides a method for installing a door / window cover, a matched tool, a fitting and the door / window cover. The invention is characterized in that the method adopts an expansion bolt with a nail or a screw nail, a
dowel and a connecting piece component, and comprises the steps of arranging a support bar and a glue groove on the door / window cover and a wall, tightly blocking by a wedge, injecting foaming glue and the like; and the invention provides the door / window frame cover with a support bracket, a perpendicularity disc, a chamfer clamp, an expansion bolt with a nail or a screw nail, a
dowel, a support bar, a glue groove, a wedge, a connecting piece, a hasp with a connecting piece, a glue groove and a support bar. The invention has the advantages of being firm in installation, improving the work efficiency, saving the glue, improving
moisture-proof, sound-proof and heat-preserving effects, and prolonging the service life of the door / window cover.