The invention discloses a multifunctional magnifying lens which is mainly used for dermatosis diagnosis and treatment. The lens is provided with a lens body, and 8-10 small LED bulbs are embedded into the periphery of the lens body. A battery box and a light intensity adjusting button are arranged at a handle part. A dividing ruler is arranged on one side of the handle part, the area of sick skin can be measured, and a pencil cylinder is arranged at the tail end of the handle part so that data can be conveniently recorded. The sick skin can be observed at any time in any place through the multifunctional magnifying lens, and limitation from a light source is avoided.