The present invention discloses a method for discriminating high-voltage direct current commutation failure considering direct current variation. The method comprises the following steps: step 1, a turn-off angle expression of an inverter and an expression of direct current are respectively obtained; step 2, the turn-off angles under a single-phase earth fault and a three-phase short-circuit faultare calculated respectively; step 3, if only one phase voltage changes when there is a fault, go to step 4, and if all three phase voltages change when there is a fault, go to step 5; step 4, if theturn-off angle under the single-phase earth fault is less than or equal to the minimum turn-off angle under the commutation failure of the inverter, it is determined that the commutation fails, otherwise, it is determined that the commutation succeeds; step 5, if the turn-off angle under the three-phase short-circuit fault is less than or equal to the minimum turn-off angle under the commutation failure of the inverter, it is determined that the commutation fails, otherwise, it is determined that the commutation succeeds. By using the method provided by the invention for discriminating the high-voltage direct current commutation failure, the risk of commutation failure can be discriminated accurately.