The present application provides an ambient light sensor and an electronic device, which may improve detection accuracy and detection performance of the ambient light sensor. The ambient light sensor includes: a light filtering unit array including a plurality of light filtering units, the plurality of light filtering units including a color light filtering unit, a white light filtering unit and a transparent light filtering unit, the white light filtering unit being configured to pass a visible light signal and block an infrared light signal, and the transparent light filtering unit being configured to pass the visible light signal and the infrared light signal; a pixel unit array including a plurality of pixel units, the plurality of pixel units being configured to receive a light signal after the ambient light passes through the plurality of light filtering units for an ambient light detection.