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 8000-18000 ppm, potassium ranged from 8000-17000 ppm, calcium ranged from 15-250 ppm, and the balance of water.