The invention relates to a lifting lug high-precision assembly and connector detecting and coordinating method. The front end of a machining interstage section is connected with a locating pin hole ofa secondary engine and a locating pin hole of a primary engine. A front lifting lug is installed on a rear skirt of the secondary engine. A rear lifting lug is welded to a front skirt of the primaryengine. The primary engine is in butt joint with the interstage section, and the interstage section is in butt joint with the secondary engine. The position degrees of the front lifting lug and the rear lifting lug are detected. If the position degrees do not meet the requirement, the position of the front lifting lug is adjusted until the installing requirement is met. According to the method, bymeans of the front lifting lug high-precision assembly technology, the multi-connector standard unified coordination technology, the front and rear end face locating pin hole high-precision torsionalangle control technology, and the two-lifting-lug accurate measurement and adaptation technology study, a set of technology methods for ensuring lifting lug assembly and connector detection coordination is made systematically. The problems that existing bin striding section high-precision assembly is difficult, the efficiency is low, and the product quality is instable are solved. The superiorityof bin striding high-precision assembly of the method is further reflected.