The invention discloses a point inversion method for ocean surface wind field inversion. According to the characteristics that the distribution close to a peak value of an objective function of a conical scanning polarimetric scatterometer is flat, the method uses the rate of change of the maximum value of the objective function with wind direction as a measure index to extend a first fuzzy solution wind direction and a second fuzzy solution wind direction, to improve a circle median filter method and thereby to improve the accuracy of ocean surface wind field inversion. According to simulation experiments, the wind field inversion method disclosed by the invention can obviously reduce wind direction reversion deviation in most regions of an earth orbit under the condition that external wind direction information is not required to be used as reference, and can effectively wipe off wind direction fuzzy solutions within 0-15 degrees. Thereby, the method can further improve the wind direction inversion accuracy of the conical scanning polarimetric scatterometer and can be used in the operational ground application system of a spaceborne conical scanning polarimetric scatterometer.