The invention discloses a method and a device for installing and regulating light equipment and a steel structure. The method comprises the following steps of: (1) firstly inspecting a foundation and prepared holes of stone bolts; (2) pairwise connecting the lower parts of four stone bolts to form a box structure by four angle steels; (3) placing the four fixed stone bolts into the prepared holes, regulating according to required precision, welding a reinforced concrete plate and an embedded part arranged on the foundation outside each angle steel for fixing after the regulation; (4) groutingthe stone bolt holes after each stone bolt is completely regulated; (5) welding an intermediate steel plate between two oppositely angle steels; (6) cutting a hole by taking the intersecting positionof a diagonal intersection point of the stone bolts and the intermediate steel plate as a center, welding a nut on the top of the hole, and installing a bolt on the nut so as to be used as a jackscrew for regulating a structural stand column of the equipment. The method and the device prevent and reduce the consumption and also greatly enhance the labor efficiency.