A self-enclosed electrical assembly with a wire crimping structure, including an installation faceplate, a front assembly, and a back assembly affixed to each other using buckles. The front assembly includes a base plate and an open-top enclosure member extending perpendicularly from the base plate. Disposed inside the enclosure member are plug insertion pieces with wire receiving slots. The back assembly includes a top panel and a shell body extending perpendicularly from the top panel. Disposed within the shell body is a wire crimping structure, which includes a wire crimping block and an inserted member. The wire crimping block has multiple wire crimping notches respectively spatially corresponding to the wire receiving slots. After the back assembly and the front assembly are affixed to each other, the inserted member is used to press the crimping block to crimp the wires into the wire receiving slots.