The present application provides a photoelectric switch key which includes a shell (10), a circuit board (20), a photosensitive component (30) and a press component (40). The photosensitive component (30) is electrically connected to the circuit board (20), and the press component (40) is provided with a light-shielding member (41). The press component (40) is movably mounted on the shell (10) to enable the light-shielding member (41) to move relative to a light-receiving surface of the photosensitive component (30). The photosensitive component (30) is capable of receiving external light when the light-shielding member (41) is moved away from the light-receiving surface of the photosensitive component (30). The light-shielding member (41) is adjacent to and shielding the light-receiving surface of the photosensitive component (30) when the press component (40) is pressed. The light-shielding member (41) is enabled to completely block the external light from irradiating on the photosensitive component when the key is pressed by the user, which achieves the function of the key, and improves the sensitivity of the key. Moreover, it is unnecessary to arrange an additional pairs of infrared emission tube to supply a light source, and the structure is simple and compact, which is conducive to the development of key miniaturization.