The invention discloses a safety protective device for an elevator door lock loop. The safety protective device for the elevator door lock loop comprises the elevator door lock loop, wherein a plurality of door lock switches are connected in the door lock loop in series, a door lock protective device is connected between every two adjacent door lock switches in the door lock loop in series and comprises an audion, a load, a capacitor, a relay and a rectifying circuit are connected between a c electrode and a b electrode of each audion in series, one load is connected with a light-emitting diode in parallel, and a contact switch of each relay is connected in the door lock loop in series. The original door lock loop is modified, the door lock protective devices are additionally arranged, and therefore a maintenance worker can rapidly judge the position of a fault point of the door lock loop and visually watch the electric wiring conditions of an elevator door. A special wire sealing method is adopted and avoids the artificial accidents caused by omission of wire jumpers, the reliability of safe operation of an elevator is largely improved, and the maintenance time after the elevator breaks down is shortened to the maximum extent.