Pipe fitting connecting structure and pipeline assembly with same

The utility model relates to the technical field of air conditioners, in particular to a pipe fitting connecting structure and a pipeline assembly with the same. The pipe fitting connecting structure comprises a main pipe and an auxiliary pipe, the main pipe is provided with an inner cavity and further comprises a flange, the flange is bent from the end face of the main pipe and located in the inner cavity in the axial direction of the auxiliary pipe, the flange surrounds to form a connecting hole, part of the auxiliary pipe is located in the connecting hole, the part, located in the connecting hole, of the auxiliary pipe abuts against the flange for limiting, and the auxiliary pipe is fixedly connected with the main pipe. The utility model further provides a pipeline assembly which comprises the pipe fitting connecting structure. Compared with the prior art, the pipe fitting has the advantages that the part, located in the connecting hole, of the pipe abuts against the turned-over edge for limiting, so that