A grid-connected wind-photovoltaic hybrid power generation system and a power generation method thereof. The system includes a wind power generating set and a solar photovoltaic array which are connected to a power grid respectively, a detection device (11), a power storage device (12) and a master control device (13). When the sum of the output power generated by the wind power generating set and the output power generated by the solar photovoltaic array is greater than a fluctuation range of the output power required by the power grid, the master control device (13) controls the power storage device (12) to store electrical energy therein; and when the sum of the output power is smaller than the fluctuation range of the output power, the master control device (13) controls the power storage device (12) to discharge electrical energy. During the operation of the grid-connected wind-photovoltaic hybrid power generation system, a supplemental generating set and the power storage device (12) can adjust the power delivered to the power grid by the power generation system in real time according to the amount of the output power.
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