Method for extracting natural D-bornel from branches and leaves of camphor trees

The invention relates to a method for extracting natural D-bornel from branches and leaves of camphor trees. The method comprises the following steps of: crushing branches and leaves of the camphor trees used as raw materials, and carrying out catalytic treatment, catalytic fission and sublimation, crystallization, and chromatography process operations. As alcohol is added into pulp of the branches and leaves of the camphor trees, the method for extracting natural D-bornel from branches and leaves of camphor trees greatly enhances the active ingredients extracted from the branches and leaves of the camphor trees, and the purity of the extracted low-purity natural D-bornel crystallinesubstance can be enhanced to more than 98% by the chromatography process. The invention has the advantages of high extraction rate, high purity, saving of a great amount of precious natural resources, little investment of equipment, low production cost and simple operation, and is suitable for industrial production.