Delay control circuit based on operational amplifier detection input voltage

The utility model discloses a delay control circuit based on operational amplifier detection input voltage, which comprises a power supply circuit, a control circuit and a relay, the power supply circuit is electrically connected with an external switching power supply, the control circuit is electrically connected with the power supply circuit, the relay is electrically connected with the control circuit, and the relay is electrically connected with a lamp. By arranging the power supply circuit, the output voltage of the external switching power supply can be converted into the voltage required by the control circuit and the relay; by arranging the control circuit and comparing monitored input voltage with reference voltage, when the input voltage is larger than a set value, the relay is switched on, and the switching power supply supplies power to the lamp, so that it is guaranteed that the power supply voltage of the lamp does not start from 0V, the lamp can be prevented from being started in the starting