The invention discloses a photovoltaic power generation system stability verification method and an apparatus. The method comprises the following steps: acquiring current operation data of a load in a photovoltaic power generation system; according to the current operation data, determining capacity configuration scopes of a plurality of units in the photovoltaic power generation system, wherein the plurality of units comprises a photovoltaic power generation unit, an energy storage unit and a controllable micro power supply unit; according to the capacity configuration scopes, determining verification sample data, wherein the verification sample data is used for carrying out stability verification on the photovoltaic power generation system; according to the verification sample data, carrying out the stability verification on the photovoltaic power generation system. In the photovoltaic power generation system stability verification method of the related technology, volatility of the load in a power grid is not considered so that cascading failures of a large power grid are easy to generate and system safety is endangered. By using the method and the apparatus in the invention, the above problem is solved.