The utility model discloses a cone winder yarn automatic compensating device, include the frame and follow supreme rack -mounted spindle position in proper order down, lead yarn compensation arrangement and yarn barrel, it constructs including leading yarn locating part and tension compensator to lead yarn compensation arrangement, it leads yarn board I and leads yarn board II including what agree with each other to lead the yarn locating part, lead yarn board I and lead yarn board II and all be by the U font structure of rotation 90, the U word open end of leading yarn board I and leading yarn board II is relative each other, tension compensator constructs including a tension disc, evenly distributed has a plurality of preformings on the inside wall of hollow circle, be provided with the pressure input shaft of equivalent amount on the lateral wall of hollow circle on the position corresponding with the preforming. The utility model discloses simple structure adds and lead the compensation of yarn locating part guide yarn implementation tension, and the yarn stroke is tortuous, and it is spacing to be convenient for, prevents that the yarn from droing, but compensates the compensation range who has improved yarn tension greatly in the process chamber moreover, section of thick bamboo yarn high quality, and low in production cost, economic benefits is high.