Abstract: In order to extend the service life of oilfield water injection well tubing and improve oilfield recovery efficiency, a method based on ultrasonic reflection method for identifying oilfield water injection well tubing corrosion was proposed. Firstly, the ultrasonic reflection method was used to collect the ultrasonic signal of oilfield water injection well tubing. Then, wavelet analysis was used to eliminate signal noise and extract signal features from both time-domain and frequency-domain perspectives. Finally, the signal features were input into the SVM classifier, and based on the classification results of the signal features output by the classifier, the corrosion identification of the oil field water injection well string was achieved. The experimental results showed that the proposed method had strong recognition performance and high recognition rate.