The invention provides a distributed photovoltaic island detection dynamic blind area index prediction method. The method comprises the step of: establishing a time sequence of a distributed photovoltaic island detection dynamic blind area index evolution system; processing time sequence measured data by a non-linear pure-body method; carrying out reflection operation on a target function value of a top point; further carrying out distributed photovoltaic island detection dynamic blind area index prediction and calculation; and obtaining a distributed photovoltaic island detection dynamic blind area index predicted value. By adopting the method, a distributed photovoltaic island detection dynamic blind area index is predicted and calculated according to the monitored parameters, a blind area detection algorithm is adjusted in real time according to a calculation result, an island detection blind area phenomenon is effectively avoided, and the reliability and the economic performance of a photovoltaic power generation system is substantially improved.