The invention discloses a quaternary platinum-based light-alkane dehydrogenation catalyst and a preparation method thereof. The catalyst comprises four components: Pt, Sn, Zr, and Ce, wherein Zr and Ce are added in the preparation of a carrier small aluminium oxide ball, and Sn and the active component Pt are uniformly loaded on the carrier by adopting an impregnation method; based on the weight of the catalyst, the content of Al2O3 is 95.0%-98.0%, the content of Pt is 0.1%-1.0%, the content of Sn is 0.1%-2%, the content of Zr is 0.5%-3.0%, and the content of Ce is 0.5%-2%. The catalyst prepared by the invention has the good catalytic activity when being used in propane dehydrogenation reaction, the catalyst has no obvious activity reduction after multiple-time regeneration, the average conversion per pass of propane is 37% and more, the propylene selection is more than 90%, and the good regeneration stability can be shown.