The invention discloses a method for recycling camphorsulfonic acid. The method is used for aqueous solution with camphorsulfonic acid salt generated in the production process of ephedrine. The method includes the steps: performing acidic precipitation; performing filtration to remove inorganic salt to obtain camphorsulfonic acid aqueous solution; concentrating the camphorsulfonic acid aqueous solution, adding sulfuric acid to crystallize; performing filtering and washing to obtain the camphorsulfonic acid. The method is simple and stable in process, high in optical purity, low in energy consumption and production cost and suitable for large-scale industrial production, retrieving rate is 90% or more, and waste gas, waste water and solid waste are less and easily controlled.