The invention provides a method for performing deep concentration and solid-liquid separation on strong brine. The method mainly comprises the following steps: enabling the strong brine to be suppliedinto a crystallizer and performing indirect heat exchange with a refrigerating medium, scraping an ice crystal and stirring to form brine concentrated solution ice slurry containing a suitable size of the ice crystal; and filtering and separating through a floating-bed-type washing tower, to obtain the ice crystal and brine concentrated solution. The method is used for performing the deep concentration of the strong brine, the high-concentration brine concentrated solution can be obtained, and operation is safe and reliable, a pipeline is not easy to be blocked. In combination with other technologies, the brine concentrated solution can be also used directly, and regenerated resource utilization of wastewater is realized.