Kuan rash-removing foaming agent and preparation method thereof

The invention discloses a Kuan rash-removing foaming agent and a preparation method thereof. The foaming agent comprises an active medicine component, a foam matrix and water, wherein the active medicine component is prepared from amur cork tree bark, common cnidium fruits, lightyellow sophora roots, belvedere fruits, tree-of-heaven ailanthus bark, cablin patchouli herbs and swamp mahogany through water extraction or alcohol extraction; the foam matrix comprises lauryl sodium sulfate, polysorbate 80 and glycerol. The foaming agent has excellent antibacterial, anti-inflammatory, itching-relieving and rash-removing effects and has greater advantages in treating severe skin inflammations, no propellant is needed, a manual foam generator can be directly adopted, the cost can be saved, pollution can be reduced, and meanwhile, the foaming agent is safer.