Drilling jig for machining connecting gusset of rotating frame of annular cooler and using method

The invention relates to the technical field of machining of annular coolers, and provides a drilling jig for machining a connecting gusset of a rotating frame of an annular cooler. The drilling jig comprises two hinged drilling jig bodies and a regulation mechanism, wherein a plurality of jig holes corresponding to working holes of the connecting gusset to be machined are formed in each drilling jig body; the same sides of the two drilling jig bodies are used for supporting and pressing the connecting gusset to be machined; the regulation mechanism is arranged between the two hinged drilling jig bodies to regulate a working angle between the two drilling jig bodies. The drilling jig can be adapted to changes in included angles of connecting gussets of annular coolers in different specifications, and is multipurpose and higher in universality, so that the manufacturing cost of a product is greatly lowered; in addition, the drilling jig has higher operability on a machining site, and a working angle of the dri