Abstract: A universal digital fish-eye lens testing system was designed.The system is composed of illumination system, testing plate, equivalent parallel plate system and ball screen, and the illumination system is configured of plane reflector, cylindrical fly-eye lens array and alignment lens. In this way, the volume of system is reduced, the utilization rate of light energy and uniformity of illumination are improved, and the size of the illumination spot can be adjusted. An angle dividing ruler is carved on the inner wall of ball screen for testing the field of view(FOV) of lens.The range of illumination FOV for testing system is φ8.1 mm~φ36.3 mm, the illumination uniformity is 91%, and the luminous flux of testing system is above 5 000 lm which is adjustable. The testing system can test the performance of various types of fish-eye lenses with 1DLP, 3DLP, 3LCD and 3LCOS in 0.55″~1.55″chip size, such as FOV angle, resolution, color rendition, chromatic aberration, and the projection effect. It has strong general availability, and can reduces the cost of testing.