The invention discloses a method for quantitatively calculating integrated risks of shaft integrity. The method comprises the following steps of: analyzing failure forms of shafts, discuss failure inducements and researching factors inducing the failures; analyzing severity degrees of shaft integrity damages and carrying out grading; determining probabilities of inducing shaft integrity damages by certain and uncertain factors; calculating risk grades of evaluation factors; carrying out risk sequencing on possibilities of different shaft integrity damage conditions; comparing importance of indexes in shaft shield risk factors; and carrying out integrated risk evaluation on the shaft integrity by utilizing a risk matrix method. The method has the advantages that only single risk factors are analyzed and the boundedness of shaft integrity failure risk factors is determined by means of professional experiences of experts, so that the discrimination of shaft key risks can be instructed preferably, the potential safety hazards can be decreased or eliminated in time, and the shaft safety during the operation can be ensured.