Emergency lighting fixtures are composed of several parts, including light source, light source driver, rectifier, inverter, battery pack, and sign lamp housing. Normally, 36V drives the light source to illuminate normally through the light source driver, while supplementing the battery pack with electricity through a rectifier. Even if the lighting is turned off after work, the rectifier still operates in a charged state, so that the battery pack is always in a full combat readiness state. When encountering an emergency situation and the mains power suddenly stops, the inverter will automatically start the inverter circuit, converting the low voltage energy of the battery pack into high voltage energy, and driving the light source to continue lighting.