The present invention relates to a wastewater treatment system for simultaneously removing chromaticity, total phosphorus, and E. coli, and a treatment method thereof. According to the present invention, there is provided a wastewater treatment system for removing chromaticity, total phosphorus and E. coli simultaneously, comprising: a bioreactor in which wastewater is introduced and stored; A biomass supplied to the bioreactor and reacting with wastewater stored in the bioreactor; A membrane filtration unit for filtering and discharging the treated water generated by the decomposition of the wastewater after the wastewater and the biomass react with each other; An ultraviolet shielding membrane disposed on the upper portion of the bioreactor and shielding the ultraviolet light to prevent the biomass from being damaged by irradiation with ultraviolet light; And a heat exchanger for uniformly controlling the temperature inside the bioreactor, wherein the biomass uses light emitted from the light source as an energy source and at the same time, the carbon dioxide mixed with the air mixed in the diffuser provided in the bioreactor is used as a carbon source Thereby culturing in the bioreactor.
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