The invention relates to a small medical device. A magnet 2 is fixed in the top part of the upper section 1 of a housing, a micro-motor 3, a motor shaft 4 and an eccentric wheel 5 are integrated into a whole and are arranged below the magnet 2, a positive pole wire and a negative pole wire are led out by the micro-motor 3, a positive pole is connected with a metal gasket 12 through line welding, the negative pole wire is led to a threaded port at the lower section and screwed with a rear screw cap 16, the metal gasket 15 is fixed in the rear screw cap 16 and connected with a power supply, the metal gasket 12 is welded to a series connection wire of a micro-switch 10, an electronic element 9, the positive pole 7 of an indicating lamp and a metal surface 6, the negative pole wire of the indicating lamp and the metal surface 11 are respectively welded to the negative pole wire of the power supply, and if the rear screw cap 16 is not screwed down, no current passes and only magnetotherapy is performed; the current can pass only after the rear screw cap 16 is screwed down, and then magnetotherapy massage is started; and when the micro-switch 10 is started, the indicating lamp 7 is turned on, the metal surface 11 is held by the hand of a person, the metal surface 6 is in contact with the skin of the person, the current passes through a human body to form a loop, and electrotherapy massage is performed. The produced magneto-electrotherapy synthetic method can be widely applied to treatment of a dozen of diseases in the departments of internal medicine, surgery, gynecology, pediatrics, otolaryngology, skin and the like, and has the advantages of small product size, high quality, low price, safety, reliability and convenience in carrying and use.