The present invention provides an ultrasonic bending fatigue testing machine for ceramics, the machine includes: a) a generator; b) a data converter which connected to both generator and oscilloscope; c) measuring and control units; d) supporting frame; wherein the measuring and control units collaboratively includes a piezoelectric or magnetostrictive transducer, a mechanical amplification transducer (ultrasonic horn), cut-off switch and an electronic displacement gauge.