The invention relates to a passive window wall system with the functions of light guiding, sun shading and air venting. The passive window wall system comprises a window frame, a horizontal planter, a lower hanging window, a sun shading and light guiding plate, a fixed window, a sun shading curtain and a middle hanging window, wherein the lower hanging window, the sun shading and light guiding plate, the fixed window and the middle hanging window are sequentially arranged on the window frame from top to bottom; the sun shading curtain is arranged at the inner side of the fixed window; the horizontal planter is located at the outer side of the window frame and is located at the tilted upper part of the lower hanging window, and the horizontal planter and the window frame are integrally poured and formed. According to the passive window wall system with the functions of light guiding, sun shading and air venting, disclosed by the invention, the contradiction among sun shading, light catching and air venting of a common external window system is solved, strong direct-illuminating light rays in a room can be filtered, dazzle light is avoided, the air venting volume of an external window in not influenced while high-quality natural light catching is provided, and a healthy indoor environment and a good visual field are provided.