Channel type yarn washing device

The utility model provides a channel type yarn washing device. The channel type yarn washing device comprises a yarn feeding device, a washing device, a drying device and a winding device. The washing device comprises 2-4 washing units, each washing unit comprises a tubular channel, a padder and a metering pump, a yarn inlet and a yarn outlet are formed in the two ends of each tubular channel, and a liquid outlet and a liquid inlet are formed below each yarn inlet and the corresponding yarn outlet respectively; a roller is arranged on the padder, the roller is connected with an air cylinder and a servo motor, and a liquid receiving disc is arranged below the roller; the first washing unit is arranged in a constant-temperature water bath, and an ultrasonic generator is arranged below the first washing unit. According to the device, less water is used through the small-hole-diameter channel, original impurities and oiling agents of the yarn are washed away, meanwhile, auxiliaries beneficial to subsequent yarn c