A C-type arm image correction method based on perspective imaging model calibration comprises the following four steps: step 1, designing a calibration panel calibrated by a C-type arm system; step 2, obtaining distortion coordinates of marked points by image processing on distorted images; step 3, calibrating the C-type arm system, including system calibration of three dimensional coordinates of marked points on the calibration panel, perspective imaging models, distortion models and distortion coordinates to obtain perspective imaging parameters; step 4, correcting images, namely, the calibrated perspective imaging models are used for correcting the distorted images. In the method, the C-type arm system calibration and the C-type arm X-ray distorted projected image correction are considered as a whole on line, and the C-type arm system is calibrated and the C-type arm X-ray distorted projected image is corrected based on the perspective imaging model of the camera, thereby changing the traditional method that image correction is first carried out off line and then linear calibration is carried out and ensuring concise and convenient system steps an easy on-line use.