High-hardness and high-salinity wastewater treatment device and use method thereof

The invention relates to the technical field of wastewater treatment, and discloses a high-hardness and high-salinity wastewater treatment device which comprises a seed crystal fluidization tank, an agent storage tank and a crystallization and granulation fluidized bed, the crystallization and granulation fluidized bed is connected with the seed crystal fluidization tank and the agent storage tank through pipelines, and the treatment device further comprises a multi-effect evaporation system. The liquid inlet position of the multi-effect evaporation system is connected with a liquid outlet end pipeline of the crystallization and granulation fluidized bed, the liquid return position of the multi-effect evaporation system is connected with a liquid inlet end pipeline of the crystallization and granulation fluidized bed, the air outlet end of the multi-effect evaporation system is connected with a condenser through a pipeline, and the condenser is connected with a vacuum pump through a pipeline; the liquid retur