The invention provides a novel bifurcation diagram drawing method suitable for a sliding mode variable structure control inverter. The method comprises the steps of 1, establishing a sliding mode variable structure control discrete iteration mapping model; 2, analyzing conventional bifurcation diagram drawing methods and determining the reasons for the inaccurate determination of stability domains and bifurcation behaviors thereof to find a solution; 3, researching the mechanism of the phenomenon of sudden change of states; 4, according to the mechanism of sudden change of states, deriving a method of variable-sampling point inverter bifurcation diagrams drawing and drawing a corresponding diagram. The invention provides the variable-sample point bifurcation diagram drawing method; it is proved that bifurcation diagrams drawn with the method can determine systematic stability work regions accurately and can be used for analyzing bifurcation behaviors of systems; finally the accuracy of theoretical analysis is verified through circuit experiments and research results provide reference for the research of nonlinear behaviors of sliding mode variable structure control inverters and drawing of bifurcation diagrams thereof.