Plastic-steel door and window corner strength reinforcing structure

The utility model relates to the technical field of plastic-steel doors and windows, and discloses a plastic-steel door and window corner strength reinforcing structure which comprises a first frame and a second frame, the lower end of the first frame is attached to the right side of the second frame, grooves are formed in the first frame and the second frame correspondingly, and L-shaped supporting plates are fixedly connected into the grooves; threaded rods are rotatably connected to the opposite angles of the L-shaped supporting plate, fixing blocks are slidably connected to the rod walls of the threaded rods, rotating plates are rotatably connected to the two sides of each fixing block, the back sides of the rotating plates are rotatably connected with the two inner walls of the L-shaped supporting plate, and rotary knobs are in threaded connection to the rod walls of the threaded rods. And the knob is rotationally connected with the fixed block. According to the scheme, the rotary knob is rotated, the fi