The pneumatic low-temperature regulating valve is composed of a pneumatic diaphragm actuator and a low-temperature regulating valve body. The multi spring actuator has low height, light weight, and simple equipment. The valve body of the pneumatic thin film low-temperature regulating valve has an S-shaped flow channel. The pneumatic low-temperature regulating valve has the advantages of compact structure, light weight, sensitive action, small pressure drop loss, large valve capacity, accurate flow characteristics, and easy maintenance. It is suitable for working below 0-250 ℃. It is composed of a pneumatic thin film actuator and a valve body with a long neck connecting pipe. The function of the long neck connecting pipe is to seal