The invention relates to a direct-current-bus-based wind-solar independent power grid system, which comprises a power generating set, an alternating current direct current (ACDC) switching power pack, a group of frequency converters, a high-voltage inverter, an energy storage device and a control subsystem, wherein the ACDC switching power pack is used for converting alternating current generated by the wind generating set into direct current, and transmitting the direct current to a direct current bus; the current input ends of the frequency converters and the high-voltage inverter are connected with the direct current bus respectively; the energy storage device is connected with the direct current bus through a two-way DCDC switching power supply, and is connected with a low-voltage inverter; and the control subsystem is used for controlling the voltage stability of the direct current bus and regulating the input and output power balance of a power grid. The stable direct current bus is established to directly supply power to a load, so that the power supply stability of a load system is ensured; simultaneously, a secondary inverting link is eliminated, and the utilization rate of wind and solar energy is increased; in addition, ACDC switching power supplies and the two-way DCDC switching power supply can run both independently and in a grid-connected way, grid connection is easily realized, and the direct-current-bus-based wind-solar independent power grid system has high extensibility.