The invention discloses a pipe winding body final assembly structure of a pipe winding heat exchanger and a winding assembly method thereof. The structure comprises a cylinder integrally welded; multiple layers of spiral heat exchange pipes are encircled on the outer wall of the center cylinder; two adjacent layers of heat exchange pipes are opposite in rotating direction; multiple radial positioning plates are symmetrically and uniformly distributed at the two ends of the outer wall of the center cylinder; the end parts of multiple layers of support bars are clamped in the radial positioningplates in sequence; semicircular positioning holes are uniformly distributed in the support bars; the heat exchange pipes are clamped in the semicircular positioning holes layer by layer; support pipes clamped in the semicircular positioning holes are arranged on one sides of all the layers of heat exchange pipes; and the contacted surfaces of the support pipes with the support bars are fixedly welded. The support bars are uniformly fixed on the outer wall of the center cylinder through the radial positioning plates, so that the weights of all the layers of heat exchange pipes and support pipes can be uniformly distributed on the radial positioning plates, the load of the support pipes and the heat exchange pipes to the support bars is relieved, and the reliability and the safety of pipe winding bodies are improved.