The invention discloses a vertical-axis wind turbine with counterweights, which comprises blades, a vertical shaft, a power generator unit, the counterweights and clamp plates. The power generator unit comprises a power generator, a controller and an accumulator. The rotation inertia of the wind turbine is changed by the counterweights mounted on the blades, instant wind power which is high in speed and short in lasting is transferred to the rotation inertia of the blades, and the blades can rotate for a longer time after strong wind stops, so that operation time of the wind turbine is prolonged, the instant high-power is converted into the output power which is delayed and stable, the power generation efficiency of the wind turbine is improved greatly. Accordingly, the vertical-axis wind turbine with the counterweights is applicable to places with high instant wind speed, such as airports, train track sides, subway tunnels and the like.