Circulating water discharge wastewater treatment method adopting reclaimed water source

The invention relates to a circulating water discharge wastewater treatment method adopting a reclaimed water source, which comprises the following steps: homogenizing circulating water discharge wastewater of the reclaimed water source through a raw water regulating tank, feeding the homogenized circulating water discharge wastewater into a flocculation sedimentation tank, and adding a hardness removal agent, a flocculant and PAM (polyacrylamide) for flocculation sedimentation. The treated wastewater is sent to an LEC electrocatalytic oxidation device, and functional group structures of organic pollutants in the wastewater are destroyed in an electrolytic catalytic oxidation manner, so that the organic pollutants are degraded into carbon dioxide and water. The circulating water subjected to LEC electrocatalytic oxidation treatment is fed into a circulating water post-treatment device to be treated, and generated waste gas is fed into a tail gas treatment device to be treated. Hardness removal and turbidity r