The invention relates to the field of comprehensive recovery and utilization of secondary resources of noble metals, in particular to a method for recovering platinum from a waste barium-sulfate-based platinum catalyst. The method for recovering platinum from the waste barium-sulfate-based platinum catalyst sequentially comprises the following steps of A, oxidation roasting, B, ball-milling mixing, C, high-temperature roasting, D, water solution, E, hydrochloric acid solution and F, filtering and drying. The method is short in process, low in production cost, easy to implement and high in platinum recovery rate.