The invention relates to a runner for a direct-connected low-speed small mixed flow type water turbine applied in a hydrodynamic energy-saving cooling tower, which comprises an upper crown (1), a lower ring (3) and curved surface blades (2) mounted between the upper crown (1) and the lower ring (3), and is characterized in that the ratio of the height h of water inlet edge (4) of each blade (2) to the diameter D1 corresponding to the water inlet edge (4) is 0.18-0.22, the ratio of the overall height H of the blades (2) to the diameter D1 is 0.35-0.42, the ratio of the diameter D2 corresponding to the intersection point A of each water outlet edge (4) and the lower ring (3) to the diameter D1 is 0.4-0.6, the ratio of the diameter D3 corresponding to the intersection point B of each water outlet edge (4) and the upper crown to the diameter D1 is 0.3-0.45, the ratio of the diameter D4 in the position of a water drain round platform on the upper crown (1) to the diameter D1 is 0.1-0.2, and the relationship between the diameter D1 and the rotational speed of cooling fan blades is D �¢ 1 = n �¢ 11 × H / n . The invention has the advantages of simple structure, convenience in design and mounting and high energy conversion efficiency.
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