The invention discloses a method for target improvement of reverse power protection failure based on reason analysis. The method comprises the following steps of S100, detecting an active power curveof a power generator after a main throttle valve of a steam turbine is closed, and further drawing a volt-ampere characteristic curve of a reverse power protecting device; S200, determining the waveform characteristic of an active power curve of a power generator, and analyzing a particular changing reason; S300, analyzing the characteristic of the volt-ampere characteristic curve, and testing accuracy of the protecting device; and S400, performing targeted improvement according to the change reason of the active power and the accuracy of the protecting device. Through waveform characteristicanalysis of the volt-ampere characteristic curve and the active power curve, targeted improvement is performed after the specific reason for reverse power protection failure is defined, and the influence factors which are related with analysis of the two characteristics are considered in the improvement process. Because the method comprises analysis of comprehensive characteristics, other problemsare prevented when one problem is settled.