Algae removal method and algae removal device

The invention provides an algae removal method, and relates to the technical field of sewage treatment. The algae removal method comprises the following steps: S001, conveying sewage and algae in the sewage into a coagulating basin on a ship body through an extraction device; s002, adding a coagulant and magnetic powder into the coagulating basin to obtain a first mixture; s003, conveying the mixture into a flocculation basin, and adding a flocculating agent into the flocculation basin to obtain a second mixture; s004, conveying the second mixture into magnetic separation equipment, and adsorbing magnetic powder and magnetic flocculation groups; and S005, conveying the magnetic powder and the magnetic flocculation group into magnetic drum separation equipment, separating the magnetic powder and the magnetic flocculation group into magnetic powder and algae mud, recovering the magnetic powder, and performing dehydration treatment on the algae mud. By adopting the method, algae, suspended solids and TP in water