Door fixing plate is used to connect the door plate with the door frame, door shaft or other structural parts of the accessories, usually made of metal (such as cold-rolled steel, stainless steel or aluminum alloy) or high-strength plastics, through the screws, welded or snap and other ways of fixing to enhance the stability of the door structure, dispersion of the force, to prevent deformation of the door plate or loosening of the role of the design of the form of a variety of (such as L-type, Z-type, U-type or hidden), according to the type of door (such as indoor doors, industrial doors) and installation needs (such as load-bearing, rust, aesthetic) flexible choice. Its various design forms (such as L-type, Z-type, U-type or hidden type) can be chosen flexibly according to the type of door (such as indoor door, industrial door) and the installation requirements (such as load-bearing, rust prevention, aesthetic) to ensure that the door opens and closes smoothly and is safe and durable.