The utility model discloses a circuit breaker undervoltage coil no-voltage time delay device which comprises a transformer T, a charging circuit and a time delay circuit. The charging circuit and the time delay circuit are connected with the transformer T separately. The charging circuit comprises a relay J, a capacitor C1, a capacitor C2, a resistor R2 and a rectifier bridge D1. The time delay circuit comprises a capacitor C3, a resistor R1, a resistor R3, a switch K1, a switch K2, a rectifier bridge D2 and a transistor S. The rectifier bridge D1 of the charging circuit is connected onto the secondary winding of the transformer T. The switch K1 of the time delay circuit is connected onto the secondary winding of the transformer T. Through the above method, the circuit breaker undervoltage coil no-voltage time delay device of the utility model is installed on a circuit breaker to make the original circuit breaker has the undervoltage time delay function, and not only the adding process is quite convenient, and but also the advantage of better reliability can be realized.