The invention concerns an ultraviolet radiation water disinfecting device for an open channel (1) wherein the water to be disinfected flows along a direction D, the device comprising a plurality of longitudinal means (6) forming UV lamps each consisting of a UV lamp (6a), a protective sheath (6b) made of UV-transparent material and connectors arranged substantially longitudinally along the direction D and being distributed into a plurality of vertical modules (4), each module consisting of a beam (4) whereto are fixed at least two means forming vertical supports (5) housing at least one series of said means forming lamps (6) provided beneath said beam (4) one above the other. The invention is characterized in that said upstream support-forming means are mounted in accordance with n planes (N, N', N'') substantially perpendicular to said direction D, n being greater than 1.
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