Method for emergently eliminating algal blooms

The invention discloses a method for emergently eliminating algal blooms, which comprises the following steps: paving an aeration device in a river channel in advance, enabling an aeration position to be a certain height away from the bottom of the river, starting aeration to increase the dissolved oxygen value of a water body to a certain value, stopping aeration, spraying clay mixed liquid into the river channel, and drawing a clay adsorption characteristic curve graph according to a test. Starting the aeration device at a time node I at the end of the fastest stage of the clay adsorption rate, increasing the dissolved oxygen in the water body to a certain value, stopping aeration again, starting the aeration device at a time node II at which the clay adsorption curve reaches balance, increasing the dissolved oxygen in the water body to a certain value again, and stopping aeration; a clay sedimentation characteristic curve graph is tested and drawn, a third time node when the sedimentation height of 80% of