The invention provides a photovoltaic power station subtransient potential parameter prediction method, which comprises the steps of acquiring the actual output power of a photovoltaic power station under a standard weather condition, the rated voltage of each photovoltaic panel in the photovoltaic power station and the rated power of the photovoltaic power station, determining photovoltaic powerstation transient potential prediction parameter values at various weather factor influence factor states according to different weather influence factors; determining photovoltaic power station subtransient potential parameter prediction values at different PN junction temperatures according to a function of the variations of the output over time of the photovoltaic panel under the standard weather condition; determining a photovoltaic power station subtransient potential parameter prediction value at the current environmental temperature, air humidity, wind power strength and illumination intensity; and determining a final photovoltaic power station subtransient potential parameter prediction value. According to the invention, analysis is performed on factors influencing the subtransient potential, photovoltaic power station subtransient potential parameter prediction is improved to the greater extent, the calculated value is enabled to be closer to a true value, a corresponding power generation plan is scheduled, and thus the economic cost is reduced.