The invention discloses a calculation method of photovoltaic capacity based on multi-irradiation year weather scenes, belonging to the field of new energy acceptance capacity evaluation. The method includes establishing a basic information set of each photovoltaic power station and inputting corresponding information; establishing the historical meteorological information database of each photovoltaic power station and calculating the historical solar radiation characteristic index of each photovoltaic power station; selecting typical scene years and generating annual meteorological scene databases of each photovoltaic power station; calculating the output time series of each photovoltaic power station in each typical scenario year; based on the daily operation simulation, carrying out thepower system sequential operation simulation with the objective of minimizing the annual operation cost, and obtaining the annual actual output time series of each photovoltaic power station. According to the actual output time series of the year, the acceptance capacity of each photovoltaic power station in different typical scenario years is calculated. The invention makes the output sequence of the photovoltaic power station closer to the actual operation and can consider the influence of different meteorological factors to obtain the detailed and accurate actual output data of the photovoltaic power station and realize the accurate evaluation of the photovoltaic power generation acceptance.