A LED illumination device includes a carrier structure, a suspension structure, and a light-emitting structure. The carrier structure includes a carrier body and a first heat-conducting body fixedly disposed inside the carrier body. The carrier body has an outer thread structure disposed on an outer perimeter surface. The first heat-conducting body has a bottom contacting surface exposed from a bottom side of the carrier body. The suspension structure includes a first suspension element detachably disposed on a top side of the carrier body. The light-emitting structure includes a circuit substrate and a light-emitting unit. The circuit substrate is detachably disposed on the bottom side of the carrier body to contact the bottom contacting surface of the first heat-conducting body, and the light-emitting unit is disposed on the circuit substrate. Therefore, heat generated by the light-emitting unit is guided to the first heat-conducting body through the circuit substrate.