The present invention relates to the field of tobacco machinery equipment detection, and particularly relates to a novel loose-end cigarette signal acquiring and processing method. The device of the loose-end cigarette signal acquiring and processing method is composed of three parts: namely a signal acquisition part, a signal conversion part and a signal output part. According to the technical scheme of the invention, the design is conducted by means of the ARM embedded software. A loose-end signal input by a novel photoelectric loose-end detection sensor is matched with a signal required for the main control system of a current universal type cigarette making and tipping machine unit, so that the loose-end signal conversion function is realized. At the same time, the phase auto-calibration of loose-end signals is realized automatically according to the installation position of equipment, so that the loose-end detection accuracy is improved. According to the technical scheme of the invention, infrared loose-end detectors can be applied to a large amount of cigarette making and tipping machines in batch, so that the cigarette making and tipping quality is improved. Meanwhile, the material waste is reduced and the cost is saved.