The invention discloses an anti-sedimentation device for a coal-water slurry storage tank, which is characterized in that it comprises a tank body, several vertical agitators, purging devices, side agitators and spoilers, and the tank body is provided with a tank cover and A number of slurry outlets, vertical agitators are evenly distributed in the tank along the center of the tank, the vertical agitator is fixed between the bottom wall of the tank and the tank cover, and the purger includes a side wall arranged outside the bottom of the tank The main pipe, several branch pipes, several valves and air compressors, each branch is provided with a separate valve, the main pipe is connected to the air compressor, and the air compressor blows compressed air into the tank through the main pipe and branch pipes. The present invention fundamentally solves the anti-sedimentation problem of the coal-water slurry storage tank, enables the coal-water slurry to have the fluidity like water for long-distance transportation, has better anti-sedimentation effect than other forms, and can effectively solve the problem of storage tank operation safety Hidden dangers, reducing the pressure on corporate logistics cleanup.