PURPOSE: A reactor for photocatalytic degradation of wastewater is provided in which ultraviolet light sources and photocatalyst-coated tubes are geometrically arranged in shell, and wastewater flows in the shell so that wastewater is photocatalytically degraded on the surface of the photocatalyst-coated tubes by irradiation of the ultraviolet light sources. CONSTITUTION: The reactor comprises a wastewater inflow part; a photocatalyst layer comprising a plural ultraviolet light sources(150) and a plural photocatalyst-coated tubes(140) arranged in such a structure that the photocatalyst-coated tubes surround the respective ultraviolet light sources; a fixing member for fixing the photocatalyst-coated tubes and the ultraviolet light sources to the reactor; and a treated wastewater discharge part, wherein the ultraviolet light sources and the photocatalyst-coated tubes of the photocatalyst layer are positioned in such a way that a longitudinal direction of the ultraviolet light sources and the photocatalyst-coated tubes is perpendicular to a wastewater flow direction, wherein the reactor further comprises a dispersion plate mounted between the wastewater inflow part and the photocatalyst layer, and a prefilter(130) mounted on the front part of the photocatalyst-coated tubes, wherein the photocatalyst-coated tubes are aluminum tubes coated with photocatalyst, wherein the photocatalyst-coated tubes are formed in a simple tube shape, a tube shape on the surface of which pins are formed or a mesh tube shape, wherein the fixing member comprises first perforated mesh and second perforated mesh, wherein the ultraviolet light sources ultraviolet lamps or ozone lamps having central wavelength of 180 to 370 nm, and wherein the photocatalyst-coated tubes are arranged in a distance of 5 to 10 mm.
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