The invention discloses a method for mitigating the aging of an insulating rubber tape and relates to the technical field of communication materials. The method comprises: pumping paint into a high pressure steam spray gun along with continuous stirring, dispersing the paint in the high pressure steam spray gun through high-pressure steam, and directly injecting the paint along with gas flows to anon-adhesive surface of the rubber tape in a uniform sweeping manner so that a high compact coating with thickness of 0.15-0.25mm is formed on the non-adhesive surface of the rubber tape. The insulating rubber tape resists a high temperature, is insulative, prevents water and permeation, is suitable for outdoor use of electric wires and cables, guarantees safety in use, has a long service life and can be used in a harsh environment. The paint on the non-adhesive surface of the rubber tape further enhances the anti-aging properties of the rubber tape and withstands extreme environments.