The invention discloses a method for identifying the hazard inducing risk of hard rock burst of a big deeply-buried cavern. The method comprises following steps: carrying out an in-situ crustal stresstest; taking a cylindrical rock sample from the position where the crustal stress test is carried out; utilizing a multichannel ultrasonic flaw detector to emit an ultrasonic flaw detection signal tothe cylindrical rock sample, calculating the hard rock crack initiation strength under three states [sigma]cij(j=1,2,3); utilizing a range principle to calculate the equivalent crack initiation strength [sigma]ci*; and comparing a rock strength/stress ratio under a self-weight stress field and a tectonic stress field with the equivalent crack initiation strength [sigma]ci* so as to evaluate the grade of hard rock burst of a deeply-buried cavern. The method is realized through a on-site stress test, an indoor single axis compression test, and an ultrasonic and sound emission coupled system; the rock stress/strength ratio of the equivalent crack initiation strength of a hard rock can be obtained effectively; the evaluation on the stability of a deeply-buried cavern, the evaluation on the grade of hard rock burst hazard, and control of hard rock burst hazard are optimized, and technical support is provided for improving the stability of a deeply-buried cavern and optimizing the control on hard rock burst hazard.