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Aiming at the urgent demand of automatic measurement and automatic assembly of large precision device, an automatic measurement method of large precision device contour is proposed. First, the global coordinate system is established by laser tracker, multiple camera coordinate systems is calibrated based on the global calibration and all the camera coordinate systems can be transformed to the global coordinate system. The center of the laser strip is precisely extracted by the Image processing methods such as Clustering method, flooding method and so on, by which ghosting and ambient light can be overcome; Statistical filtering method is used to remove the clutter of 3d data point cloud, by combining the sample-consistent initial registration algorithm and the iterative nearest point matching method, the 3d point cloud fusion is carried out for the laser bars under multiple cameras. The whole product is scanned by moving the precision device, and when the contours of the precision device are out of tolerance ray method will give warning. The experiment shows that the measurement error standard deviation of this method for large parts is 0.25mm, and the measurement time is 15 minutes for 20 meters long parts, which is enough to meet the assembly requirements of large precision and complex products. This technology breaks through the existing technical bottleneck, it can carry out rapid and accurate 3d reconstruction of the contour of precision parts, and can calculate the structural parameters of precision parts.