The utility model relates to a U-shaped tube heat exchanger with double tube flow. The utility model comprises a U-shaped tube heat exchanger, wherein the U-shaped tube heat exchanger comprises a tube sealing head, a shell pass barrel body, U-shaped heat exchange tubes, a tube plate and a shell pass outlet, wherein a U-shaped tube heat exchange tube with double tube flow is composed of more than two U-shaped heat exchange tubes in series. Both ends of the U-shaped tube heat exchange tube with double tube flow are fixed on the tube plate. The utility model has the advantages of novel, reasonable and compact structure, easy fabrication, large effective area and high heat efficiency, and effectively solves the problem that the tube plate has poor utilization rate. Compared with the U-shaped heat exchanger of the prior art, under the same conduction of the heat exchange area, the convection heat transfer coefficient of the double-tube flow heat exchange tube improves 2.5 times more than that of the common heat exchange tube, when the influence of the structure on the convection heat transfer coefficient is only considered. When the heat exchanger is larger, the convection heat transfer coefficient is greatly improved, and the heat transfer effect is better.