Disclosed herein is a blue-green algae remover, including: 0.1 to 1 w t% of sulfuric acid 2 to 10 wt % of potassium sulfate 1 to 10 wt % of magnesium sulfate 1 to 10 wt % of borax 5 to 40 wt % of zinc sulfate 1 to 20 wt % of boric acid and residual water. Since the blue-green algae remover, compared to a conventional blue-green algae remover, is dispersed in water while not being precipitated in water, if it is previously sprayed before the generation of blue-green algae, the generation of blue-green algae can be prevented. Therefore, this blue-green algae remover can also be widely used as an agent for preventing the generation of blue-green algae.
