An electromechanical safety for weapons (1), provided with a mechanical safety device, includes a base electronic unit, actuating an electromechanical transducer (2) acting on the safety mechanical device, and a transponder (5), the base unit providing a central control and processing unit, connected with a transceiver unit (4), continuously transmitting an enquiry signal, able to talk with the transponder (5), when the latter is within the transmission range of the transceiver unit (4), the transponder (5) having no power supply and receiving the power necessary to its operation from the signal transmitted by the transceiver unit (4), said at least one transponder (5) transmits, an identification code and the base unit actuates the electromechanical transducer (2) in such a way to release the safety mechanical device when receives an identification code corresponding to a code stored in the base unit and actuating the electromechanical transducer (2) in such a way to insert the safety mechanical device as soon as the base unit no more receives the identification code.