The invention relates to power grid technology, in particular to an insulating detergent film-forming adhesion performance testing method. The method includes following steps: according to area of glass tanks and pollution level, preparing artificial pollution liquid, uniformly smearing the artificial soiling liquid on the surfaces of the glass tanks, putting the glass tanks into a constant-temperature oven for drying, and testing adhesion of pollution layers; using a glass syringe to suck different amounts of cleaning detergent, and uniformly dropping on the surfaces of the glass tanks smeared with the pollution liquid to enable the pollution layers to be in three set states; observing film-forming state of the pollution layers along with time under action of the detergent, photographingthe three glass tanks 24h later, performing gray processing, and recognizing self-striping area of the pollution layers in the three wet states; testing adhesion of non-self-striping portions of the pollution layers, and comparing the adhesion with initial adhesion; testing film-forming adhesion performance according to adhesion change and self-striping area of the pollution layers before and after action of the insulating detergent, and comparing the three wet states to acquire impact of detergent consumption on the adhesion and the self-striping area of the pollution layers. The method can provide a basis for selection and consumption of the insulating detergent.