Automatic fiber cleanliness detector

The utility model discloses an automatic fiber cleanliness detector, which comprises a liquid storage tank, a test pipe, a light emitting diode (LED) light source, an illumination sensor and a liquid level sensor; a liquid level switch is arranged in the liquid storage tank, the lower part of the liquid storage tank is provided with a liquid inlet pipe connected with the test pipe, the lateral surface of the liquid storage tank is provided with an overflow port, and the other side of the liquid storage tank is connected with a cleaning electromagnetic valve; the bottom of the test pipe is provided with the LED light source and a concave lens, the bottom of the test pipe is connected with the liquid level sensor, the top of the test pipe is provided with the illumination sensor, the lateral surface of the upper part of the test pipe is provided with an air vent connected with the overflow port, one side of the bottom is connected with a liquid inlet electromagnetic valve, and the other side of the bottom is connected with a liquid discharge electromagnetic valve; and a calibration pipe is arranged in parallel on one side of the test pipe. A vertical light path measurement method is adopted, the measurement automation degree is high, the accuracy is high, the influence of human factors and environmental factors on the measurement results is avoided, and the measurement results are objective and accurate.