Physical and chemical treatment device and method for circulating cooling water of power plant

The invention discloses a power plant circulating cooling water physicochemical treatment device which comprises a circulating water tank 1, a circulating water pump 2 and a circulating water pump 3, an input port of the cyclone set 4 is connected with the circulating water pool 1 through a pipeline, a circulating water pump 2 is arranged between the circulating water pool 1 and the cyclone set 4, and the circulating water pump 2 is used for pumping circulating cooling water into the cyclone set 4; the hydrodynamic cavitator group 5 is arranged above the hydrocyclone group 4, and an input port of the hydrodynamic cavitator group 5 is connected with an upper output port of the hydrocyclone group 4 through a pipeline; the first filter 6-1 is arranged below the cyclone group 4, an input port of the first filter 6-1 is connected with a lower output port of the cyclone group 4 through a pipeline, and an output port of the first filter 6-1 is connected with the circulating water tank 1 through a pipeline; an input