Saline injection machine can evenly inject the brine and salt auxiliary materials into the meat blocks, which can shorten the pickling time and greatly enhance the taste and yield of the meat products. The machine can be adjusted with stepping rate, stepping distance, platen gap and injection pressure according to the technological requirements. Then the brine and salt auxiliary materials can be injected into the meat evenly and continually to reach the optimal effects. With precise design, reasonable structure, easy operation, convenient rinse and demountable driving chains, the machine is ideal equipment for meat processing.