Device and method for detecting defect of complex surface ruby bearing

The invention discloses a device and method for detecting a defect of a complex surface ruby bearing. In the device, a transparent detection disk is used for bearing the ruby bearing and sequentiallyrotating the ruby bearing to positions of a front camera and a reverse camera to carry out detection; the front camera, a 2-octave-band coaxial telecentric lens and a white point light source are usedfor acquiring a first coaxial light image of the ruby bearing, calculating image coordinates of the ruby bearing and each annulus radius and carrying out defect detection on a plane and an appearanceoutline; the front camera, the 2-octave-band coaxial telecentric lens, 0-degree blue annular side light and 90-degree blue annular backlight are used for acquiring a first annular light image of theruby bearing and carrying out defect detection on an outer diameter, a slot diameter, an aperture and a curved surface; a red filter is used for filtering environment stray light; and the reverse camera, a reverse 2-octave-band