Connecting joint

A connecting joint, comprising a connecting tube (1) and a first compression sleeve (2), wherein the connecting tube (1) comprises a first tube connecting section (12) for connecting a first tube (4) and a second tube connecting section (11) for connecting a second tube (3), the first tube connecting section (12) and the second tube connecting section (11) are communicated and an annular connecting plate (13) is arranged therebetween, the first compression sleeve (2) is sleeved on the second tube connecting section (11), a first insertion hole (6) with an annular cross-section for the second tube (3) to be inserted into is formed between an inner wall of the first compression sleeve (2) and an outer wall of the second tube connecting section (11), a first annular groove (111) is formed in an outer surface of one end of the second tube connecting section (11) close to the annular connecting plate (13), and an end portion of one end of the first compression sleeve (2) close to the annular connecting plate (13) is bent toward the second tube connecting section (11) and inserted into the first annular groove (111).