The invention provides a photovoltaic power station generating unit power curve modeling method and device, and relates to the technical field of photovoltaic power station power generation. The photovoltaic power station generating unit power curve modeling method comprises obtaining multi-group actual operation parameter data of a photovoltaic power station generating unit; determining normalized active power corresponding to each group of actual operation parameter data in dependence on the actually-measured active power and the actually-measured photovoltaic module temperature in each group of actual operation parameter data and a preset normalized temperature; fitting out a first power curve model at the normalized temperature by means of a fitting mode in dependence on the normalized temperature, the actually-measured irradiance and the normalized active power; and determining a theoretical power curve model of the photovoltaic power station generating unit in dependence on the first power curve model and the actually-measured photovoltaic module temperature by means of a preset generating efficiency condition. According to the invention, the problem that the photovoltaic power station generating unit power curve modeling mode in the prior art is not accurate in result can be avoided.