Protective slag is an important auxiliary material in continuous casting production. With the development of China's steelmaking and continuous casting technology, the technology of silicon manganese alloy powder protective slag has also made continuous progress. However, in the current context of fierce competition in the steel market, continuous casting is undergoing comprehensive technological improvement with characteristics such as specialization, constant casting speed, high quality, and multiple varieties. Whether China's protective slag technology can meet the needs of comprehensive improvement in continuous casting technology is a common concern for continuous casting production plants, researchers, and manufacturers of protective slag.