Disclosed are a TFT array substrate, a method for fabricating the same and a display device. The TFT array substrate includes a plurality of pixel units, each of the plurality of pixel units includes a common electrode (9). The common electrode (9), is comb-shaped, and includes a plurality of strip electrodes and a plurality of slits. Each of the strip electrodes is configured for reflecting light incident on the strip electrode, and each of the slits is configured for transmitting light incident on the slit. As the comb-shaped common electrode with both a reflective region and a transmissive region is formed through a single patterning process, the fabrication process is simplified and the fabrication cost and difficulty are reduced.