Protective plate for plastic-steel doors and windows

The utility model discloses a protective plate for plastic-steel doors and windows, which comprises a first concave plate and a size adjusting mechanism, a second concave plate is sleeved in the firstconcave plate, third concave plates are respectively arranged on two sides of the first concave plate, the third concave plates are fixedly connected with the second concave plate, the size adjustingmechanism is arranged in the first concave plate, and the size adjusting mechanism is arranged in the second concave plate. A first sliding groove is formed in the size adjusting mechanism. Accordingto the utility model, the second concave plate is pulled manually, and the second concave plate can slide in the first sliding chute through the first sliding block, so that the purpose of adjustingthe length and the size is achieved, the concave plate can be adjusted according to the size of the plastic-steel door and window, and the frame of the plastic-steel door and window is completely shielded; in addition, the third