Assembly type prefabricated column connecting structure and construction method thereof

The invention discloses an assembly type prefabricated column connecting structure, and relates to the technical field of assembly type buildings, the assembly type prefabricated column connecting structure comprises a supporting steel frame and an embedded steel bar embedded in a prefabricated column, the embedded steel bar extends out of the end of the prefabricated column, and the supporting steel frame is provided with a first bearing part and a second bearing part; a bearing ball is fixedly arranged on the supporting steel frame and located between the first bearing part and the second bearing part, the bearing ball is fixedly connected with the first bearing part, a plurality of connecting supporting plates are arranged on the second bearing part, all the connecting supporting plates are hinged to the bearing ball, and all the connecting supporting plates are distributed in the circumferential direction of the bearing ball; the first bearing part is used for being installed at the top end of a lower pre