The invention discloses an installing joint and an installing method for a support hinge concrete prefabricated part, and belongs to the technical field of constructional engineering. An embedded ironpiece is arranged at the bottom of the support end of the support hinge concrete prefabricated part, a hole is formed in the center of the embedded iron piece, and an inverted-frustum-shaped prefabricated hole is formed in the upper side of the hole; mortar is flatly laid on the top face, except a connecting hole, on the support position, for containing the concrete prefabricated part, of a support concrete part; a hoisting rod is adopted for hoisting the concrete prefabricated part and inserted in the connecting hole, and after a lifting hook is removed, the hoisting rod is rotated and adjusted to the installing height of the concrete prefabricated part, and after the mortar strength reaches 2MPa, the hoisting rod is removed; and connecting steel bars are inserted in the inverted-frustum-shaped hole and the connecting hole, and after concrete grouting materials are poured, the surface is subjected to sleeking. The hoisting rod capable of being repeatedly utilized is adopted in the installing joint and the installing method, the hoisting rod can be used as a hoisting ring and can also be used for adjusting the installing height and the installing precision of the concrete prefabricated part, steel consumption can be reduced, the installing work intensity is lowered, the installing efficiency, precision and quality are improved, and the construction cost is reduced.