The invention discloses a rotated experience orthogonal decomposition-based irradiance area division method which mainly comprises the steps of performing standardized matrix averaging on annual total radiation amount data; performing EOF (experience orthogonal function) decomposition on an annual total radiation variable field matrix based on the standardized matrix averaging result of the annual total radiation amount data; based on the EOF decomposition result of the annual total radiation variable field matrix, rotating a load matrix and a factor matrix according to a varimax orthogonal rotation principle, and respectively calculating a variance contribution rate and an accumulative variance contribution rate; dividing irradiance areas according to the calculation results of the variance contribution rate and the accumulative variance contribution rate. By adopting the rotated experience orthogonal decomposition-based irradiance area division method, the defects of poor stability, low energy conversion efficiency, poor environmental friendliness and the like in the prior art can be overcome to realize the advantages of good stability, high energy conversion efficiency and good environmental friendliness.