The invention discloses an illuminating device, in particular to a movable illuminating device capable of being disassembled and assembled automatically. The movable illuminating device capable of being disassembled and assembled automatically comprises a lamp holder main body and main body lifting devices used for supporting the lamp holder main body. At least two lifting type illuminating device bodies are mounted on the lamp holder main body. The lamp holder main body comprises a main body support and one or more main body stand columns mounted at the top of the main body support. The main body lifting devices are hinged to the main body stand columns through lifting movable inch rods and lifting movable inch rod floating rods correspondingly. A lifting power assembly is arranged on one side of each main body lifting device, and the whole lamp holder main body is supported through the lifting power assemblies. By adoption of the illuminating device, the requirement for rapidly arranging the high-power movable illuminating device outdoors can be fully met, and the movable illuminating device can be used by customers conveniently and has great beneficial effects for improving working efficiency.