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A method is proposed to solve the problem that soft packaging strip occurrence deviation in movement.The working principle and composition of the system were introduced, this system uses machine vision real-time capture strip edge, uses histogram modified method correction image gray, highlights the strip edge characteristic in the image through enhanced contrast,uses edge detection method based on first-order differential identify edge and determine the edge location, uses Fuzzy+PID combining model implement deviation control. The experiment results show that, the LED light source and Microvision digital camera, in 200 m/min medium speed and in 10 mm/s correcting mechanism speed, correction precision between ±0~±1 mm, steady-state error is small, the relative error is small. This system satisfies the needs of soft packaging strip correction.