The invention discloses an intelligent monitoring method based on a nuclear power station unit. The method comprises the following steps: obtaining basic information of operation of the nuclear power station unit in a monitoring site; converting the basic information into auxiliary operation task executing information and displaying the auxiliary operation task executing information; judging whether the auxiliary operation task executing information comprises more than two alarm information; and if so, transmitting the alarm information to a master control room according to the alarm priority level which is defined in advance. An intelligent and efficient monitoring technology based on the nuclear power station unit is achieved. In addition, the invention further discloses an intelligent monitoring system based on the nuclear power station unit.