Fuel level laser sensor

The utility model relates to a fuel level laser sensor, which comprises a laser diode, photosensitive resistors, optical fibers and an engine base mounted on a fuel tank. The upper portion of the engine base is provided with a dark cavity, the laser diode and two photosensitive resistors are arranged in the dark cavity, light emitted by the laser diode passes to the bottom of the fuel tank via two optical fibers and then is bent upwards, light of one optical fiber irradiates to one photosensitive resistor used as a reference resistor after penetrating a clearance standard oil layer height, and light of the other optical fiber irradiates to the photosensitive resistor which is used as a variable output resistor after penetrating through an actual oil layer height in the fuel tank. Because oil can absorb certain light, ratio of the actual oil layer height to the standard oil layer height can be obtained according to parameter comparison between the variable output resistor and the reference resistor, and then d