The invention discloses a cotton-dacron combiner. The cotton-dacron combiner is characterized by comprising a rack, a dacronyarn steaming device, a cotton yarn steaming device, a cotton-dacron combining device and a yarn storing frame, wherein the dacronyarn steaming device, the cotton yarn steaming device, the cotton-dacron combining device and the yarn storing frame are arranged on the rack. The dacronyarn steaming device and the cotton yarn steaming device are arranged in an upper and lower layer mode, the cotton-dacron combining device is arranged at the output end of the dacronyarn steaming device and the output end of the cotton yarn steaming device and comprises a combining roll shaft and multiple yarn guide rods which are parallel to the combing roll shaft and sequentially arranged in the conveying direction, and therefore cotton yarn and dacron yarn are combined together without undergoing high-temperature treatment. The cotton-dacron combiner is simple in structure, convenient to operate, lower in energy consumption and more excellent in performance compared with the prior art.