The invention belongs to the technical field of structural design and assembling technologies of main propeller hubs of helicopters, and particularly relates to a structure and assembling technology of a propeller blade connecting joint. At present, one structure is to assemble and mount a lining with a large protruding shoulder into a hole through the temperature difference, the other structure is to assemble and mount a straight lining into the hole through the temperature difference, and then a large gasket is bonded to the hole end face through an adhesive agent. The linings of the two connecting joints adopt the mode of temperature difference assembly, initial damage of the inner surface of the hole has uncertainty, binding force of the hole and the lining is small, and the hole and the lining are prone to generating fretting wear after the hole is subjected to force. According to the structure of the propeller blade connecting joint, a lining is mounted in a connecting hole, thelining is provided with a protruding shoulder, the lining is mounted in the connecting hole through a secondary extruding strengthening method, the lining is used for transmitting the force, and the width of the protruding shoulder of the lining is smaller than 10 mm; and a guiding gasket is arranged on the periphery of the protruding shoulder, the easily occurred problem of sliding of the liningcan be avoided, and meanwhile, the problem of upwarp by excessively extruding strengthening assembly of the protruding shoulder is solved.