The invention discloses a gas sensing material for a low-power-consumption and high-sensitivity methane sensor. The gas sensing material comprises a one-dimensional silicon nanostructure and a titanium dioxide shell layer. The sensing material comprises the following preparation steps: (1) preparing the one-dimensional silicon nanostructure by using a metal-assisted chemical etching method; (2) uniformly modifying titanium dioxide on the one-dimensional silicon nanostructure by using one of a titanium dioxide sol drop-coating method, a titanium dioxide sol dip-coating method, a titanium dioxide sol spin-coating method and a physical vaporous deposition method; and (3) carrying out high-temperature annealing to form the one-dimensional silicon nanostructure and a core-shell structure of titanium dioxide, wherein the core-shell structure realizes the resistive supersensitive gas sensing of methane at room temperature. The methane sensing material has the advantages of high response sensitivity, good restoration property and low power consumption and can be used at room temperature.