The invention relates to a novel multi-strand flow heat exchanger, which comprises a casing, heat exchange pipes, an upper pipe plate and a lower pipe plate, wherein the heat exchange pipes are arranged in the casing, the upper pipe plate and the lower pipe plate are arranged at the two end parts in the casing, the positions of the two end parts of the heat exchange pipes are respectively limited on the upper and lower pipe plates, and a shell pass inlet and a shell pass outlet which are communicated with an inner cavity of the casing are respectively formed in the casing. The novel multi-strand flow heat exchanger is characterized in that a plurality of groups of heat exchange pipes are adopted, a part, positioned between the upper and lower pipe plates, of each heat exchange pipe group is arranged in a spiral coiling way along the axial direction of the casing, and a plurality of pipe pass inlets and pipe pass inlets which are respectively communicated with the heat exchange pipe groups are formed in the casing in a way of corresponding to all the heat exchange pipe groups. The novel multi-strand flow heat exchanger has the advantages that the heat exchange efficiency is high, the energy-saving and emission reducing effects are good, in addition, through a structure of adopting the longitudinal arrangement of the sleeve and the heat exchange pipe groups, the heat exchange pipes are positioned on the pipe plates arranged on the upper part and the lower part of the casing in a centralized way, the structure stress is reasonable, the pipe pass and the casing pass can respectively bear greater pressure, the sealing effect is good, the inner leakage is completely avoided, the novel multi-strand flow heat exchanger can be used under high-temperature and high-pressure work conditions, and in addition, greater temperature and pressure fluctuation can be borne.