The invention provides a three-level Z source wind power generation grid-connected system, and belongs to the field of wind power generation. The three-level Z source wind power generation grid-connected system comprises a duplex winding vertical axis wind power generator, an unloading protection unit, a first uncontrolled rectification unit, a second uncontrolled rectification unit, a Z source impedance network, a midpoint clamping three-level inverter, a grid-connected current sampling unit, a filter inductor L<f>, a grid-connected voltage sampling unit, a Z network voltage sampling unit, a direct current bus voltage detecting unit, a bidirection DC / DC conversion unit, a charging current detecting unit and a storage battery pack. According to the three-level Z source wind power generation grid-connected system, wind energy is converted into power frequency alternating current through the three-level Z source inverter, the power frequency alternating current is connected into a power grid, and working modes are changed over in real time on the condition of different wind speeds. When the wind energy is abundant, the system is connected to the power grid and also charges the storage battery pack, and the energy is stored; when the wind energy is moderate, the system only conducts grid-connected operation; when the wind speed is relatively low, the system is supplied with electricity by the storage battery pack to conduct the grid-connected operation, and therefore new energy wind power generation and use thereof are realized. The three-level Z source wind power generation grid-connected system is suitable for a small and medium size duplex winding vertical axis wind power generator unit.