The invention discloses an improved door/window accessory transmission rod. The improved door/window accessory transmission rod comprises an outer side wall body; the outer side wall body is internally provided with a window installation groove; a window body is installed in the window installation groove in an inserting connection mode; the right side of the interior of the window body is provided with a spline groove which penetrates through the upper end surface and the lower end surface of the window body; a first motor is fixedly installed in the top wall of the window installation groove; the bottom end surface of an output shaft on the lower portion of the first motor is fixedly connected with a spline rod, the spline rod is matched and fixed to splines of the spline groove, and thebottom end surface of the spline rod is fixedly connected with a threaded rod; the threaded rod is located in the bottom wall of the window installation groove and extends downwards, and the interior, below the window installation groove, of the outer side wall body is provided with a limiting cavity; and the threaded rod is in rotary fit with the bottom wall of the limiting cavity, and a threaded slide block is slidably installed in the limiting cavity in a matched mode.