The invention discloses a collector tube combined efficient tubular countercurrent
heat exchanger and a method. Comprising a high-pressure liquid collecting
pipe A (1), a high-pressure liquid collecting
pipe B (2), a low-pressure liquid collecting
pipe A (3), a low-pressure liquid collecting pipe B (4), an inner core heat exchange pipe (5) and an
outer core heat exchange pipe (6). The high-pressure liquid collecting pipes A and B are embedded in the low-pressure liquid collecting pipes A and B respectively to form two liquid collecting assemblies, the inner core heat exchange pipe (5) is embedded in the
outer core heat exchange pipe (6) to form a heat exchange
assembly, and the two liquid collecting assemblies are connected through the heat exchange
assembly. Two ends of the
outer core heat exchange tube (6) are respectively communicated with an interlayer cavity between the high-pressure liquid collecting tube A and the low-pressure liquid collecting tube A and an interlayer cavity between the high-pressure liquid collecting tube B and the low-pressure liquid collecting tube B; the two ends of the inner core heat exchange tube (5) penetrate through the low-pressure liquid collecting tubes A and B to be communicated with inner cavities of the high-pressure liquid collecting tubes A and B. The multi-time enhanced heat exchange of fluid flowing into the cavity, flowing into the core body and flowing out of the cavity is realized, so that the heat exchange efficiency is improved.