The invention discloses a fabricated concrete frame joint and a construction method thereof. The fabricated concrete frame joint comprises prefabricated columns and prefabricated beams; each prefabricated column comprises a column main body and a column connecting rib, the outer ends of the column connecting ribs extend out of the column main bodies, the two adjacent prefabricated columns are arranged in an up-down alignment mode, and the column connecting ribs at the corresponding positions are connected; and the prefabricated beams are connected to the column connecting ribs exposed at the tops of the lower prefabricated columns. During construction, the lower prefabricated columns are arranged firstly, the prefabricated beams are hoisted to the tops of the lower prefabricated columns, the exposed beam connecting ribs and the column connecting ribs are bound into a cast-in-place area through stirrups, concrete is poured into the cast-in-place area, core-tenon inserting holes are reserved, and it is ensured that the tops of the column connecting ribs are exposed; the upper prefabricated columns are hoisted to the lower prefabricated columns, and the corresponding column connectingribs are connected through threaded sleeves or steel column legs; and concrete is poured for curing after steel bar joints are subjected to formwork erecting. Components are prefabricated parts whichare simple in structure and low in cost and have no influence on other construction, the construction process is convenient, the connecting mode is simple and reliable, and the construction quality is guaranteed.