The saline injection machine can evenly inject the pickling agent prepared by brine and auxiliary materials into the meat, which greatly improves the taste and yield of meat products. According to the process requirements, the user can inject the pickling solution quantitatively, uniformly and continuously into the meat by adjusting the stepping speed, stepping distance, meat pressing plate gap and injection pressure, so as to achieve the best injection effect of the product. Adjustable speed and pressure ensure uniform injection of products at one time, and can inject various meat products, chickens and ducks with bones.