The invention relates to the field of pipe processing, particularly to a connecting mechanism of pipes. The connecting mechanism comprises two connecting pipes, and the connecting pipes communicate with each other through an elastic pipe; the elastic pipe comprises a straight pipe and two fixed parts; the fixed parts are mounted at the two ends of the straight pipe respectively; the fixed parts comprise barrel bodies connected with the straight pipe, springs and elastic plates with through holes; free ends of the barrel bodies are connected with the springs; the two ends of the elastic plates are connected with the springs; connection parts of the barrel bodies and the connecting pipes are in interference fit; the length of the elastic plates is larger than the diameter of the connecting pipes; the inner walls of free ends of the connecting pipes are provided with threads; a groove used for limiting the elastic plates is formed in the connecting pipe at the water inlet end; a clamping groove used for clamping the elastic plates is formed in the connecting pipe at the water outlet end; the length of the groove is larger than the width of the elastic plate at the water inlet end; and the length of the clamping groove is equal to the width of the elastic plate at the water outlet end. The connecting mechanism can randomly deform, pipe mounting is facilitated, the margin has certain change, and pipe connecting is facilitated.