NOVELTY - A high-concentration magnesium salt-containing wastewater processing method comprises: placing magnesium salt-containing wastewater into a reactor, introducing ammonia gas and carbon dioxide, ammonia carbon method processing to obtain magnesium hydroxide, basic magnesium carbonate and phosphate fertilizer.    USE - A high-concentration magnesium salt-containing wastewater processing method.    ADVANTAGE - The wastewater processing method has easy separation, low processing cost, zero pollution, good economic benefit and raw material is easy to obtain. The structure of the equipment is simple, and it can realize the continuous, large wastewater processing device, which completely solves the trouble of all production enterprise for Grignard reaction magnesium salt high concentration wastewater treatment.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the high-concentration magnesium salt-containing wastewater processing device comprising amination tower (1) connected with the magnesium hydroxide thick device (2). The top of the magnesium hydroxide thick device is connected with the magnesium hydroxide filter (3). Magnesium hydroxide drying machine (5) is connected with the bottom of the mother liquid pump (4) is connected with the carbon tower (6). The carbon tower is connected with the basic magnesium carbonate thickener (7). The thickener is connected with the basic magnesium carbonate filter (8). The basic magnesium carbonate drying machine (9) is connected with the bottom of the multi-effect evaporator set (10).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the wastewater processing method.    Amination tower (1)    Magnesium hydroxide thick device (2)    Magnesium hydroxide filter (3)    Mother liquid pump (4)    Magnesium hydroxide drying machine (5)    Carbon tower (6)    Basic magnesium carbonate thickener (7)    Basic magnesium carbonate filter (8)    Basic magnesium carbonate drying machine (9)    Multi-effect evaporator set (10)