The invention relates to an automatically flexible solar airer. The automatically flexible solar airer comprises a solar panel, a storage battery, a photosensitive sensor, a first motor, a second motor, an airer, a flexing mechanism and a window, wherein the window is connected with the first motor, the airer is connected with the second motor through the flexing mechanism, the first motor and the second motor are respectively connected with the storage battery through the photosensitive sensor, and the storage battery is connected with the solar panel. The front end of the flexing mechanism is provided with an indoor airer, and the lower part of the flexing mechanism is provided with a movable supporting frame. The flexing mechanism consists of upper and lower crossed folding frames, and the two ends of the upper and lower crossed folding frames are respectively connected with the airer and the indoor airer. According to the automatically flexible solar airer disclosed by the invention, the airer automatically flexes, a whole circuit is controlled according to the association of thean optical photosensitive sensor with the intensity of the sunolar lights, the electric power for flexing the airer is from the solar panel without an additional power supply, and clothes can be prevented from being wetted when weather suddenly changes.