A high-magnesium concentrated liquid is disclosed. In a first embodiment, the high-magnesium concentrated liquid comprises magnesium ranged from 60000-70000 ppm, sodium ranged from 1000-3200 ppm, potassium ranged from 300-3000 ppm, calcium ranged from 100-300 ppm, and the balance of water. In a second embodiment, the high-magnesium concentrated liquid comprises magnesium ranged from 40000-50000 ppm, sodium ranged from 8000-28000 ppm, potassium ranged from 3000-20000 ppm, calcium ranged from 15-500 ppm, and the balance of water. In a third embodiment, the high-magnesium concentrated liquid comprises magnesium ranged from 80000-100000 ppm, sodium ranged from 3200-12000 ppm, potassium ranged from 3000-20000 ppm, calcium ranged from 100-200 ppm, and the balance of water.