The invention relates to an evaluation method for a risk of a wind power, photovoltaic power generation and energy storage combined power generation system. The evaluation method comprises the following steps: acquiring reliability statistic data of the wind power, photovoltaic power generation and energy storage combined power generation system and calculating reliability parameters of main equipment according to the reliability statistic data; establishing a reliability model, a generated-power model and a load model according to the reliability parameters; acquiring a power time sequence, an operation state time sequence and a load time sequence of the wind power, photovoltaic power generation and energy storage combined power generation system; calculating generating capacity loss risk LOEE, power shortage risk LOLE and system auxiliary service lack loss SSL of the wind power, photovoltaic power generation and energy storage combined power generation system; acquiring comprehensive risk CRV of the wind power, photovoltaic power generation and energy storage combined power generation system according to the generating capacity loss risk LOEE, the power shortage risk LOLE and the system auxiliary service lack loss SSL. According to the method, the risk factors of power generation loss and system auxiliary functions are comprehensively considered.