The invention discloses a gray cloth laser singeing system. The gray cloth laser singeing system comprises a laser device, and a laser path of the laser device is provided with a laser beam collimation unit, a half wave plate, a polaroid, a beam splitter and an optical focusing system in sequence; the beam splitter is connected with a photoelectric detector, and the photoelectric detector is connected with a data acquisition card, the data acquisition card is connected with a computer, the computer is connected with the laser device and a translation table, and the translation table is connected with a range detector. The invention further discloses a gray cloth laser singeing method. Firstly, to-be-processed gray cloth is laid on the translation table flat; secondly, the laser device is started to form a laser processing beam; thirdly, the gray cloth is subjected to singeing treatment, wherein the computer adjusts the output power of the laser device as well as the distance between the translation table and the optical focusing system according to the photoelectric detector and monitoring data of the laser device; and finally, the surface of the gray cloth becomes bright and clean, that is, singeing treatment is completed. Through the gray cloth laser singeing system and method, the problem of manually controlling the singeing precision is solved, meanwhile, singeing treatmentis uniform, the structure is simple, the cost is low, and implementing is easy to perform.