Method for removing heavy metal in water by using dried sargasso

The invention discloses a method for removing heavy metal in water by using dried sargasso. The method comprises the following steps: drying the sargasso, crushing the sargasso to prepare a biological adsorbent, then adding a heavy metal solution, adjusting concentration and pH of the solution according to the types of the metal ions, performing oscillation at constant temperature on a containing filling with a sargasso adsorbent and the heavy metal ionized water, and filtering a mixture, drying the obtained residues, adding a HCl solution or adding an alkali metal/alkaline earth metal salting liquid, performing oscillation at constant temperature on the material, filtering the mixture, recovering the heavy metal and regenerating the sargasso biological adsorbent. The method has the advantages of low cost, abundant and easily available raw materials, simple operation, high clearance of heavy metal and easy recovery, the regeneration method of the sargasso biological adsorbent is simple, and no secondary pollu