The invention is suitable for the field of nuclear power, and provides a supervising method for quadrant power incline of a reactor core of a nuclear power station. The supervising method is characterized by comprising the following steps: obtaining a logarithm of an effective thermoelectric couple in a reactor core quadrant, obtaining a pressure value and a temperature value of the effective thermoelectric couple according to a digital control system (DCS), obtaining a first reactor core power by combining an in-pile neutron flux pattern, and calculating the correction factor of the quadrant incline of reactor core power; according to the correction factor of the reactor core power, obtaining a quadrant inclination factor of a corresponding second reactor core power; supervising whether the quadrant inclination factor of the second reactor core power accords with a preset range of threshold or not in a real-time manner. The quadrant inclination factor of the second reactor core power has smaller deviation with a quadrant inclination factor of the real power. As the value of the quadrant inclination factor of the second reactor core power is supervised by a parameter value of the effective thermoelectric couple, the problem that the reactor core is abnormal can be discovered more timely, and the calculating precision and the security of the reactor core can be improved.