The utility model relates to a sulphur cooler for a flexible pipe plate. The sulphur cooler comprises front and rear end pipe boxes, front and rear end pipe plates, and a shell, wherein a heat exchange pipe group is arranged in the shell and a baffling structure is arranged for supporting the baffling; both the front and rear end pipe boxes adopt r-shaped pipe plate connecting rings to be connected with the front and end pipe plates and shell, the branch ends of each r-shaped pipe plate connecting ring respectively serves as a straight edge and a bevel edge, and the non-branch end of each r-shaped pipe plate connecting ring serves as a bottom edge; and a circular arc transition exists between the straight edge and the corresponding bevel edge. The sulphur cooler provided by the utility model has the advantages that the flexibility of the pipe plates is good, the stress level of a heat exchanger pipe head and the local stress of a joint of each pipe plate and the shell are obviously reduced, the pressure-resistant property is good, the metal temperature difference of the two sides of a thin pipe plate is small, the temperature difference stress of each pipe plate is small in the thickness direction, the reliability of the pipe head is good, and the weight of equipment is small.