The laser physiotherapy instrument is a pain treatment device that combines low intensity laser technology with low-frequency pulsed strong magnetic field function. Low intensity laser acts on human tissues, with cell activation and deep stimulation therapy effects, and has good therapeutic effects on various acute and chronic pain. The magnetic field affects the distribution of human current, the movement of charged particles, the permeability of membrane system, and the magnetic moment orientation of biopolymers, which changes the physiological and biochemical processes of histiocyte, producing analgesic, detumescent, and promoting blood and lymph circulation.