The invention discloses a cuckoo search-based photo-thermal photovoltaic bundled power generation system capacity configuration method, and aims to establish a photo-thermal power station matched witha photovoltaic power station to form a photo-thermal photovoltaic bundled power generation system in allusion to the problem of output fluctuation of the photovoltaic power station. Based on historical data of solar radiation intensity, the invention provides a method for improving system capacity configuration through cuckoo search by taking the minimum output standard deviation of the photo-thermal photovoltaic bundled power generation system as a target on the basis of complete absorption of photovoltaic power generation.