An indicator circuit for an emergency light, including: a charging circuit, in connection with a positive terminal of a lithium battery and configured to charge the lithium battery; a battery protection circuit, in connection with a negative terminal of the lithium battery and configured to provide protection against overvoltage and overcurrent of an electrical signal output by the lithium battery; a main control circuit, in connection with the negative terminal of the lithium battery and configured to compare the electrical signal output by the lithium battery with a reference voltage signal and output a control signal; and a drive circuit, in connection with the main control circuit and an indicator light, and configured to drive the indicator light to illuminate according to the control signal and turn off the indicator light in case of abnormal conditions.