The invention provides a wind resource value obtaining method based on a mass conservation diagnosis mode. The method comprises the following steps: obtaining actual measured data of a wind field and constructing an initial wind filed; setting a model parameter, fixing the value of alpha1 as 1, and by taking a long-time wind speed sequence space component value relation based on empirical orthogonal function decomposition as a measurement standard and by taking a dominant wind direction analysis result of each wind measurement tower as a reference of a wind direction diagnosis effect, determining alpha2; and adjusting the initial wind field to enable the wind field to satisfy a mass conservation equation and a total adjusting amount to be the smallest.