An intelligent rolling contact fatigue testing system and testing method therefor, including a main testing system (3), a loading system (4) and a subsidiary testing system (7), and further including a testing device, wherein the testing device includes a light source (S3), a CCD camera (S5) and a monitoring assistance device (S2), and during testing, a roller test specimen (306) and an subsidiary testing piece (706) are provided in the monitoring assistance device (S2) after being rolled in contact with each other for a certain time, and the roller test specimen (306) and the rotating brush (S210) are rotated simultaneously in a state in which the lubricating oil is sprayed, and the CCD camera (S5) dynamically collects the surface image of the roller test specimen (306), and then performing quantization evaluation on a fatigue failure state by image preprocessing, image processing and image post-processing.