The invention relates to an urban reclaimed water treatment method, in particular to an advanced treatment method of urban reclaimed water used as cooling water for a power plant. The advanced treatment method of urban reclaimed water for the power plant of the invention comprises the following steps: carrying out aeration treatment and filtering; adding slaked lime, coagulant polyferric sulfate and efficient coagulant aid; adding bactericide for sterilizing; and adding composite scale and corrosion inhibitor, and after mixing the mixture evenly, adding the mixture to circulating water of the power plant. The advanced treatment method of the invention solves the related technical problems of advanced treatment, sterilization, scale inhibition, corrosion prevention, ammonia nitrogen treatment and the like of the reclaimed water involved by reclamation of the reclaimed water in the power plant, and provides technical support for safe and economical use of the reclaimed water in the power plant, and the reclaimed water is used as make-up water for the circulating water in the power plant, and has very obvious economical, social and environmental benefits.