A pixel sensing circuit and driving method therefor, an image sensor, and an electronic device are provided. The pixel sensing circuit includes a photoelectric conversion element configured to generate electric charges in response to incident light, a transmission element configured to output the electric charges generated by the photoelectric conversion element, and a source follower circuit configured to compensate an output current of the transmission element. The source follower circuit includes a first source follower transistor, a second source follower transistor, and a first storage capacitor.