Evaluation method for preventing fire accident of large crude oil storage tank

Disclosed in the invention is an evaluation method for preventing a fire accident of a large crude oil storage tank. The evaluation method comprises the following steps: determining a risk grading standard of a fire accident of a large crude oil storage tank; selecting a typical fire accident of a large crude oil storage tank; identifying a selected fire accident occurrence reason; identifying an effective prevention measure for preventing the fire accident occurrence; determining an occurrence frequency of the fire accident occurrence reason; determining a failure probability of the effective prevention measure; calculating an occurrence frequency of the fire accident; and according to the risk grading standard, determining integrity of the prevention measure of the fire accident. For the large crude oil storage tank fire accident, a unified risk quantification standard is employed. On the basis of calculation of the fire accident occurrence frequency and the consequence magnitude, integrity of the prevention measure is analyzed; and the analysis result is precise and possibility of the fire accident occurrence is reduced.