The invention is discloses a camera lens calibration system and method thereof, which comprise a calibration platform, the calibration platform comprise a calibration structure. A calibration camera lens to be calibrated is placed on the calibration platform. An image testing module is provided for capturing a target pattern from a target pattern display through the calibration camera lens to be calibrated for getting an image pattern. The image testing module provides a contrast parameter computation for calculating the contrast parameter of image pattern and showing results on a display.