The present invention relates to a simple water supply device for purifying valley water and, more specifically, a simple water supply device for purifying valley water that effectively purifies valley water which has many fallen leaves or dirt and removes a deposited material more easily in order to extract and provide a clear first grade water, which comprises a broken stone for filtration; a raw water collection pipe located in a lower part of the broken stone for filtration and collecting raw water; a temporary raw water storage tank whose lower part is in the shape of a closed cylinder, where raw water collected from the raw water collection pipe is temporarily stored; a filter device installed inside of the temporary raw water storage tank, which is installed for sending only first grade water to the outside after removing foreign materials contained in raw water; a stirring device installed in the temporary raw water storage tank for stirring foreign materials settled in the lower part of the temporary raw water storage tank; a first grade water feed pipe connected to the filter device of the temporary raw water storage tank for discharging first grade water to the outside; a foreign material discharge pipe installed in outer lower part of temporary raw water storage tank for inducing the stirred foreign materials to be discharged to the outside; a bypass pipe located on an upper part of the temporary raw water storage tank for discharging raw water to the outside when the level of raw water collected in the temporary raw water storage tank is higher than a certain level.
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