Intelligent digital eddy current flaw detector is a fully automatic testing machine which adopts large-scale imported integrated circuits and combines the most advanced eddy current technology, photoelectric technology and computer control. With exquisitely designed mechanical transmission device, a complete mechatronics system is formed. The software compiled by WINDOWS operation platform makes the instrument more convenient and intelligent. The instrument has stable and reliable performance, high automation and fast detection speed. It is specially used for off-line inspection of hub bearings.