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PURPOSE : A supplying apparatus of clean water for tire washer is provided in which tire washing is performed using clean water, and water used in tire washing is recirculated by free fall to prevent frequent breakdown of water pump and prevent the tire and vehicle from being stained again when water of washed tire and vehicle is dried. CONSTITUTION : The supplying apparatus of clean water for tire washer comprises a membrane (A4) formed in first non-woven fabric or mat for civil engineering works for settling the foreign materials such as earth and sand in the tire washer water tank (C1) from tire washed water mixed with foreign materials such as earth and sand in tire washer water tank (C1) generated during tire washing and filtering the tire washed water by free fall; first settling tank (A2) for moving the primarily filtered water; a membrane (A5) formed in second non-woven fabric or mat for civil engineering works for settling the foreign materials such as earth and sand that are not filtered by the membrane (A4) formed in first non-woven fabric or mat for civil engineering works from water of the first settling tank (A2) in the first settling tank (A2) and secondly filtering the water of the first settling tank (A2) by free fall; a clean water supply tank (A3) for moving the secondly filtered water as clean water; a water tank (A1) for supplying clean water into the clean water supply tank (A3) from the outside so that the volume of clean water used in tire washing is constantly maintained in the clean water supply tank (A3); a ball tower (A7) installed inside the clean water supply tank (A3) and connected to the water tank (A1) to constantly maintain the volume of water; and a water pump (A6) installed inside the clean water supply tank (A3) connected to tire washer pipe (A8) to perform tire washing with clean water, wherein tire washing water in the tire washer water tank (C1) generated during tire washing is recirculated by free fall.