The invention discloses low VOC sponge which comprises the following components: grafted polyether polyol, a highly active polyether polyol, a catalyst, a foam stabilizer, a chain extender, a foamingagent, a flame retardant, RGO/TiO2 nanoparticles, and diphenylmethane diisocyanate. A preparation method comprises the steps: preparing the RGO/TiO2 nanoparticles, preparing finished sponge, preparinga composite fabric, embossing and solarizing. The low VOC sponge is applied to automotive trim. The process is simple, and the VOC content in the composite fabric can be effectively reduced; RGO/TiO2is used as a photoelectron catalyst and does not participate in a chemical reaction, so that a good recyclable catalytic effect is achieved, and the problem of subsequent VOC release of the polyurethane sponge can be continuously and effectively solved; the sponge prepared by the invention is applied to embossing, the embossing forming effect is good, and the pattern appearance is uniform; the problem that a traditional half-ether half-ester polyurethane sponge is uneven in hardness is solved, and the application prospect is wide.