The invention discloses a distributed photovoltaic power generation power prediction method. The method comprises the following steps: obtaining historical data; analyzing and calculating the data; carrying out modeling on an analysis calculation result; performing error correction on the modeling; and carrying out power generation power prediction on the distributed photovoltaic system accordingto the model after error correction. According to the method, power generation power prediction is carried out on the distributed photovoltaic power station based on historical data of the centralizedphotovoltaic power station, so that the prediction result is accurate, errors can be corrected, the prediction result is more accurate, and safe and stable operation of the distributed photovoltaic power station in a power grid can be ensured.