The invention relates to a telescopic strip for inhibiting pedestrian crossing crack generation as well as an application method and a purpose of the telescopic strip. The telescopic strip is formed by the following ingredients in parts by weight through processing: 100 parts of thermoplastic elastomers, 0.1 to 0.5 parts of antioxidants and 0.1 to 0.5 parts of shellac resin. The application method comprises the following steps that middle and lower surface layers of a pedestrian crossing adopt the segmented and layered construction, each section is between 10 and 20m, the construction sequence is from top to bottom, in the construction process of the surface layer and the middle surface layer, 0.7 to 2.2cm is reserved for a joint seam between the two section openings, after the construction of the middle and lower surface layers is completed, the telescopic strip with the matched width is selected according to the joint seam width to be embedded into joint seams between the section openings, and finally, the one-step full-covering construction is adopted on the upper surface layer for covering the telescopic strip. When the telescopic strip and the application method provided by the invention are adopted, the transverse tension can be effectively inhibited or relieved, the integral structure completeness and the attractive appearance of the pedestrian crossing can be ensured to the maximum degree, and the unification of the attractive appearance and the performance of the structure of the pedestrian crossing is realized.