The invention discloses a household LED illuminating system with an alarming function. The system comprises a lampshade, wherein a processor, an LED lamp and an electromagnetic switch and a wireless transmission module connected to the processor are arranged in the lampshade; the electromagnetic switch is connected to the LED lamp; a pyroelectric infrared sensor, a brightness sensor and a smoke sensor are arranged on the outer surface of the lampshade; and the pyroelectric infrared sensor, the brightness sensor and the smoke sensor are separately connected to the processor. The system disclosed by the invention solves the problem that an illuminating lamp in the prior art needs to be manually controlled to be turned on and off and the brightness needs to be manually controlled, and meanwhile, the action of the illuminating lamp is relatively single, and provides the household LED illuminating system with the alarming function. A natural light source can be fully utilized in application, and the service life of the light source can be prolonged, and meanwhile, a head of a household can be informed intuitively at the first time through illuminating equipment once sudden-onset disasters happen indoors, so that the escape time of the head of the household is prolonged and the escape probability of the head of the household is increased.