The parabolic mirrors with high Numerical Aperture (NA) are used as efficient light collectors and its focus with the slight deviations of the incident beam from the optical axis or from parallelism give rise to huge aberrations. A device is designed to measure and collimate the angle error between the optical axis and the structure axis of high NA parabolic mirrors. The imaging principle of the parabolic mirrors is used to analyze the angle error of the parabolic mirrors. The experimental result shows that we can get the angle distinguishing precision 0.06′ and the maximum measurable region 3.65′. The result can satisfy the application of the parabolic mirrors used as the light collector.