High-hardness and high-salinity coal mine water resource regeneration pretreatment method and device

The invention provides a high-hardness and high-salinity coal mine water resource regeneration pretreatment method, which comprises the following steps: firstly, carrying out coagulation clarification treatment, then mixing with an alkaline agent and the like, entering a chemical crystallization circulating granulation fluidized bed, carrying out calcium removal treatment under the condition that the pH value is 8.8-9.2, recovering CaCO3 crystal particles generated by reaction, further filtering the effluent, regulating the pH value to 7.8-8.3, and carrying out water treatment to obtain the high-hardness and high-salinity coal mine water resource. And then entering a sodium ion exchanger for magnesium removal treatment, and concentrating and enriching magnesium ions by using resin. The effluent of the sodium bed enters a subsequent advanced treatment system, and the magnesium-rich sludge is obtained after the sodium bed regeneration wastewater is subjected to a flocculation precipitation reaction in a high-de