The invention discloses organic/inorganic hydrogel suitable for laser marking and a preparation method and application thereof, and belongs to the field of macromolecular hydrogel material and laser making. Water-soluble macromolecular chains are adsorbed to the surface of bismuth-bearing oxide particles under physical action first, a monomer, a crosslinker and an initiator are then added to modified oxide particle water dispersion, in-situ chemical reaction is carried out by using an oxidation-reduction initiating system to obtain a three-dimensional crosslinked network structure with embedded laser-sensitive oxide particles, and organic-inorganic hydrogel is formed. The hydrogel is subjected to surface laser irradiation by using a laser making machine to generate a black mark pattern, the cost is effectively reduced, and continuous efficient large-scale marking is provided for hydrogel material. By changing the content of bismuth-bearing oxide particles in the preparation process of the hydrogel and the level of laser power in the marking process, it is possible to form eye-distinguishable text and patterns different on contrast and definition on the surface of the hydrogel.