The high-power marine engine transmission chain is a key core component of MAN low-speed two-stroke diesel engines. The product has the advantages of high precision, high fatigue resistance, and long service life. It integrates ten core technologies, including specific sequence assembly technology, low-frequency fatigue testing technology, and part sealing riveting and pressing technology. It has overcome the technical difficulties of domestic marine engines and is the only domestically produced marine engine transmission chain with intellectual property rights and MAN certification. It has been supplied to leading domestic engine manufacturers such as China Ship Diesel (CSE, DMD, YMD) and CMD, breaking the long-term dependence on imported marine engine transmission chains and achieving domestic production of marine engine chains. At the same time, it has profound significance in safeguarding national industrial security and supporting "Made in China."