Brine injection machine is to inject salt water and auxiliary materials into meat through salt water injection and vacuum rolling. The material solution injected into meat can be fully salted, penetrated and loose muscle tissue structure, which is conducive to the dissolution of myosin. Moreover, due to the enhancement of ionic strength of raw meat and the adjustment of protein characteristics, the prepared water solution can make the meat tender and soft, thus improving the meat products And the tenderness and taste of meat products.