Double-strand doubling tension balancing device

The invention relates to a double-strand doubling tension balancing device which comprises two yarn paths and a balance bag arranged between the two yarn paths, wherein after passing the balance bag, the two yarn paths are collected to a yarn collection wheel. The double-strand doubling tension balancing device is characterized in that the balance bag comprises a fixed barrel with the two ends opened; two cap bodies are respectively arranged at the two ends of the fixed barrel in a sleeving manner; a cavity is formed by the two cap bodies and the fixed barrel jointly; a spring is arranged in the cavity; the two ends of the spring are abutted against the inner walls of the two cap bodies respectively; pressure grooves for yarns to pass are formed in the tops of the cap bodies; guide wheels are arranged in the pressure grooves; and each yarn path sequentially passes a guide wire, then passes one guide wheel, and finally reaches the yarn collection wheel.