The utility model provides a novel safety belt for electric tool, including metal strip, locating piece, jack catch, constant head tank, safety belt body, force sensor, photovoltaic cell, the alarm, the speaker, alarm lamp and communication device, the metal strip inlay the middle part at the safety belt body, the locating piece adopt two, the locating piece between link to each other through the metal strip, the locating piece install in the inboard constant head tank of jack catch, force sensor install the middle part at the metal strip, photovoltaic cell install the upper portion at the alarm, alarm and force sensor link to each other. The utility model discloses the metal strip, the setting of jack catch and safety belt body is favorable to having improved tensile strength, long service life, simple structure, safe and reliable, simple operation, be convenient for marketing and application.