Cover plate for drain hole of door and window

The invention relates to the technical field of doors and windows and discloses a cover plate for a drain hole of door and window. The cover plate comprises a cover plate body, a fixed supporting armand a rotating shaft. One end of the fixed supporting arm is fixed to the cover plate body while the other end of the fixed supporting arm stretches into the drain hole, and a fixed snap joint is arranged at the end, stretching into the drain hole, of the fixed supporting arm; a mounting part is further arranged on the fixed supporting arm; a rotating shaft is arranged on the top of a baffle plate, the rotating shaft is rotatably mounted in the mounting part, the baffle plate in a natural drooping state closes the drain hole, and a water flow pushes the baffle plate to rotate to open the drainhole to drain during drainage. The cover plate can be suitable for heights of the drain holes and wall thickness dimension of profiles in a certain range, is not limited by width of the drain hole and is wider in application