The invention belongs to the technical field of surface modification of solid materials, and discloses a preparation method of a laser induction-based superhydrophilic PET surface and a product. The preparation method comprises the following steps: (a), adhering a PET film to be treated to a substrate, and preparing a metal colored layer on the PET film in a sputtering manner; (b), focusing laseron the colored layer, wherein the colored layer absorbs the energy of the laser and enables the energy to act on the surface of the PET film at a junction with the colored layer so as to form a hydrophilic surface layer on the surface of the PET film; (c), corroding the hydrophilic surface layer with a solution method so as to change the morphology of the hydrophilic surface layer and form a superhydrophilic surface layer, so that preparation of the superhydrophilic layer of the PET film to be treated is completed. A structure prepared with the preparation method provided by the invention hasthe characteristics of superhydrophilicity, high durability and the like, and is simple in technology and low in cost.