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Aiming at the problem that the valve position cannot move according to the set signal due to the loose feedback rod of the pneumatic control valve positioner, which affects industrial production, an online fault diagnosis method based on wavelet analysis is proposed. The valve position response signal of the regulating valve in the industrial closed-loop control loop is selected as the target signal, and the DB3 wavelet base is used to decompose the target signal by 6 layers, and the detailed parameters of D6 characteristics are obtained, which can accurately detect the fault occurrence time. After that, the average value AV, variance VAR and rms are calculated in segments, and the normal state operation area and fault state operation area are divided by curve fitting of the mean value AV, variance VAR and rms to realize the online diagnosis of the loose fault of the feedback rod of the pneumatic control valve positioner. The effectiveness and practicability of the diagnostic method in this paper are verified by simulation and online closed-loop system testing.