The invention discloses a pneumatic regulating valve undisturbed switching device comprising a machine body and a first cavity formed in the machine body. A vertically extending first rotary shaft isrotationally arranged in the first cavity. The tail end of the top of the first rotary shaft is in power connection with a motor fixedly arranged in the end wall of the top of the first cavity. The pneumatic regulating valve undisturbed switching device is simple in structure, reliable in performance and convenient to install, maintain and overhaul. Through the pneumatic regulating valve undisturbed switching device, passing flow can be automatically detected and is compared with initial setting, the passing flow is automatically and dynamically regulated, and constant flow passing through a valve is ensured. Meanwhile a manual mode can be achieved through switching as needed, the unchanged flow data and equipment work state are ensured in the switching process, and undisturbed switching of automatic and manual modes is achieved. Meanwhile compressed air can be generated through a micro air pump, no air source needs to be introduced from the outside, the installing process is simplified greatly, and maintenance cost of the equipment is lowered.