The present invention relates to a sludge removal device of the circular sludge collector of the sedimentation basin, in the sludge removal apparatus of the circular sludge collector of the sedimentation basin, the sludge deposited on the bottom surface (1a) through the sludge discharge pipe (8) by the injection of water Injection means (9) installed to be discharged; The sludge solidification prevention and removal part (B) which consists of the pump 10 installed in the bottom plate 5ab of the bridge 5 so that the injection of water through the said injection means 9 is comprised.;According to the present invention, sludge is strongly ejected from the water supplied by the pump 10 through the spray nozzle 9cb of the annular injection pipe 9ca of the sludge solidification prevention removal part B. The bottom surface 1a including the sludge receiving portion 1b as well as the central portion of the circular sludge collector A, because the sludge is easily removed while being stacked in the center portion of the bottom surface 1a so as to be in a hardened state. Sludge precipitated in the c) can be smoothly discharged through the sludge discharge pipe 8 without being hardened by solidification, and the sludge removal efficiency can be further improved.
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