Abstract: The present invention relates to an improved structure of switch box and particularly to a structure composed of such members as a box body, an assembly plate, a sleeving frame and a panel, wherein the box body will not be deformed in the process of grouting so that the panel can be easily installed on the box body and adjustable in line with the position of building wall surface, the panel and the building wall surface are on the same one plane, and the purposes of convenience, safety and practicability can be achieved.