The invention relates to a bare wire guide wheel alarm which comprises two guide wheels. An alarming circuit is disposed between the two guide wheels and comprises a relay, a power-on switch and a guide wheel switch, and the relay and the power-on switch form a series circuit. The relay and the guide wheel switch form another series circuit, when bare wires pass through the two guide wheels, the guide wheel switch is on, the relay is powered, the circuit formed by the relay and the guide wheel switch is closed, the relay is powered, the power-on switch is on, and the circuit formed by the relay and the power-on circuit is closed; and after the bare wires pass the two guide wheels, the guide wheel switch is off, the circuit formed by the relay and the guide wheel switch is broken, and the circuit formed by the relay and the power-on switch is still closed. The alarming circuit is disposed between the guide wheels, and enameled wires are delivered while varnishing can be monitored. The bare wire guide wheel alarm is simple in structure, and quality of the enameled wires can be guaranteed effectively.