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For involute cylindrical spur gear pitch deviation problem of automatic measurement, A method of image measurement based on machine vision is studied. The method uses the image measurement system to absorb measured cylindrical spur gear face images. According to the definition of tooth pitch deviation, the automatic measurement program of tooth pitch deviation is designed. The program can automatically collect images under test gear. And through the image preprocessing algorithm, fitting circle algorithm, Indexing circle construction, extraction measurement point and a series of processing, the program finally calculated each pitch deviation, Then it calculated a single pitch deviation, gear pitch cumulative deviation and gear pitch cumulative total deviation. An image measurement system was built to verify the method, and the experimental results were compared and analyzed. The analysis results show that the repeatability accuracy of tooth pitch measurement is better than 6 μm, and the method and system can realize the effective detection of tooth pitch deviation.