The invention discloses a method for determining the risk degree of influence on inversion stations of alternating-current junction stations. The method comprises the following steps that 1, a model of a multi-infeed alternating current-direct current system is established, including n inversion stations and m alternating-current junction stations; 2, disturbance is exerted on one of the inversion stations i, so that the voltage Ui of a converter bus i of the inversion station i is reduced by 1%; 3, based on voltage variations delta Uj of the inversion stations j in the multi-infeed alternating current-direct current system, three-phase multi-infeed interaction factors MIIFij are calculated; 4, based on the scores of the three-phase multi-infeed interaction factors, the risk degree R of a certain inversion station k is calculated; 5, the risk degree R is compared with a reference value (or a standard value) Rstandard, and when the R is greater than or equal to the reference value Rstandard, it is determined that the risk degree of the inversion station is higher than those of common inversion stations. The method has the guiding effect on finding of potential risks of direct-current station commutation failure and formulation of corresponding prevention measures and can also provide reference indexes for direct-current station address selection.