Collecting pipe of heat exchanger

The utility model relates to the technical field of air conditioners, in particular to a collecting pipe of a heat exchanger, which comprises a pipe body and a connecting assembly, the connecting assembly comprises a first circular ring, a second circular ring, four clamping blocks and four fixing pieces, the first circular ring is fixedly connected with the pipe body and located at one end of the pipe body, and the second circular ring is fixedly connected with the pipe body and located at the other end of the pipe body. The four clamping blocks are fixedly connected with the first circular ring, four circular holes are formed in the surface of the second circular ring and correspond to the clamping blocks in position, the four fixing pieces are arranged on one sides of the corresponding circular holes respectively, the first circular ring and the second circular ring are tightly pressed together, the four clamping blocks penetrate through the corresponding circular holes, the fixing pieces slide, and the fi