A fingerprint identification unit and a manufacturing method thereof, an array substrate, a display device and a fingerprint identification method are disclosed, which can realize fingerprint identification without increasing the thickness of the display device. The fingerprint identification unit can include a photosensitive device, a data read-out signal line and a thin film transistor for controlling the switching of the photosensitive device. On the photosensitive device is formed a first insulating layer for insulating the photosensitive device from an OLED luminescent layer, and the part of the OLED luminescent layer corresponding to the photosensitive device does not illuminate. The data read-out signal line can be configured to read out a photocurrent generated by the photosensitive device, and identify fingerprints according to the amount of each photocurrent. The array substrate includes the fingerprint identification unit mentioned in the above technical solution.