The invention discloses a resourceful treatment method of salinity wastewater. The resourceful treatment method comprises the following steps: firstly, pretreating the salinity wastewater through a pretreatment section to obtain high salinity wastewater meeting the requirements of nanofiltration; then introducing the high salinity wastewater meeting the requirements of nanofiltration into a nanofiltration salt separating section for nanofiltration, raising pressure and temperature of inorganic salt solutions on two sides of a nanofiltration membrane to a subcritical working condition and respectively generating monovalent inorganic salt, subcritical water and a two-phase mixture of divalent inorganic salt and the subcritical water; finally, carrying out salt water separation on the two-phase mixture of the subcritical water and an inorganic salt crystal to obtain a product containing the subcritical water and the inorganic salt crystal. The resourceful treatment method provides a combination process of nanofiltration salt separation and subcritical salt precipitation. The large-scale solvent evaporation operation is avoided by adopting a subcritical salt precipitation process; energy consumption of the system is effectively reduced while the salt purity is improved; the resourceful treatment method provides a novel process route for realizing zero discharge of wastewater.