The invention relates to an alarm inhibition method of a digital alarm system of a nuclear power station, which comprises the steps as follows: 1) function validity confirmation is carried out for an alarm signal produced in the alarm system; 2) when the alarm signal is invalid, the alarm signal is prohibited to trigger an alarm, otherwise, step 3) is carried out; 3) according to the present operating conditions, check is performed to see whether other signals inhibit the alarm signal, thus judging whether the alarm signal needs to be concerned, if not, the alarm signal is inhibited and the related alarm indicators are not triggered. By adopting the digital inhibition method of the digital alarm system of the nuclear power station of the invention, the alarm signal which is not necessarily concerned by an operator can be properly inhabited so that the alarm signal does not appear in the alarm list, which reduces the burden of the operator, improves the working efficiency of the operator and strengthens the safe operation guarantee of the nuclear power station.