It the utility model is related to underground technical field of liquid level measurement, more particularly to a kind of self-cleaning fluid level measuring instrument and its system.The self-cleaning fluid level measuring instrument includes liquid level emasuring device and self-stripping unit;The self-stripping unit is provided with the transparent liquid chamber contacted with the liquid level emasuring device;The transparent liquid chamber be used for the fluid connection in inspection well so that the liquid level emasuring device detects the liquid level of the inspection well;The self-stripping unit can discharge the drift of the transparent liquid intracavitary.The self-cleaning liquid level measuring system includes control terminal and self-cleaning fluid level measuring instrument;The self-cleaning fluid level measuring instrument electrically connects with the control terminal.The purpose of this utility model is to provide self-cleaning fluid level measuring instrument and its system, to solve the technical problem that the drifts such as silt present in prior art, gravel cause measurement data distortion.
