The invention discloses a ginger-powder blue algae treating agent. The ginger-powder blue algae treating agent is characterized by being prepared from the following raw materials in parts by weight: 20 to 30 parts of attapulgite, 15 to 20 parts of zeolite powder, 5 to 10 parts of ginger powder, 3 to 5 parts of basil powder, 2 to 4 parts of sodium caseinate, 2 to 4 parts of propylene glycol alginate, 0.5 to 1 part of litsea cubeba oil, 0.3 to 0.5 part of eucalyptus oil, 0.1 to 0.2 part of nepeta oil, 1 to 2 parts of linseed oil, 0.3 to 0.5 part of polysorbate-80, 1 to 2 parts of aluminum chloride, and 10 to 15 parts of modification addition agent. The blue algae treating agent provided by the invention not only can be used for effectively adsorbing and removing blue algae in a water body and inhibiting the growth of algae, but also has favorable effects of sterilizing and removing organic matters, nitrogen, phosphorus and heavy metal, is rich in sources of the raw materials, low in price and good in economical efficiency, moreover, has favorable biodegradability and environmental compatibility, is environment-friendly and nuisanceless, is a little in dosing quantity, quick in algae removing speed and high in practicability, and the water body and bed mud are purified effectively.