Wiper arm for windscreen wiper

The utility model provides a wiper arm for a windscreen wiper, which comprises a wiper rod, an extension arm and a spring component arranged between the wiper rod and the extension arm, and the front end of the wiper rod is rotatably connected with the rear end of the extension arm; the spring assembly is connected with the scraping rod and the extension arm and used for providing pulling force for clockwise rotation of the extension arm around the scraping rod. The scraping rod and the extension arm are provided with a limiting structure used for limiting the maximum rotation angle of clockwise rotation and anticlockwise rotation of the extension arm around the scraping rod. The wiper rod is provided with a limiting assembly used for preventing the extension arm from rotating to the maximum angle when the extension arm rotates clockwise, and the limiting assembly prevents a user from touching the extension arm carelessly when replacing the wiper brush, so that the extension arm rapidly falls back and collide