The structural characteristics, manufacturing requirements and interface accuracy requirements of helicopter composite duct are analyzed. According to the structural characteristics and requirements, a new manufacturing technology of helicopter composite duct is proposed, which includes precision manufacturing technology of parts, adhesive assembly technology of duct structure and finishing technology. The technology is discussed and its application is reported. Compared with the traditional dolphin helicopter duct manufacturing technology in many aspects, the new helicopter composite duct manufacturing technology has achieved the effects of reducing cost, shortening manufacturing cycle, simplifying tooling, improving quality and ensuring interface accuracy, which has important reference value for the precision manufacturing of other helicopter parts.