Process system for preparing salt from high-concentration saline water in coal chemical industry

The invention provides a process system for preparing salt from high-concentration saline water in coal chemical industry. The process system comprises a pretreatment system, a membrane treatment system and an evaporative crystallization system, the pretreatment unit comprises a crystallization granulation fluidized bed, a high-efficiency density sedimentation tank, a V-shaped filter tank and an ion exchange unit which are connected in sequence; the membrane treatment unit comprises a membrane concentration unit and a membrane salt separation unit; the membrane concentration unit comprises an ultrafiltration unit, a reverse osmosis unit, a silicon removal unit and an ozone catalysis unit 1; the membrane salt separation unit comprises a pre-nanofiltration ultrafiltration unit, a secondary nanofiltration unit, a reverse osmosis unit 2 and a reverse osmosis unit 3; and the evaporative crystallization system is used for performing evaporative crystallization on the nanofiltration concentrated water and the nanofi