For the above and other purposes, the present invention provides a reversible washing floating bed-type reverse sewage treatment system treatment method, which contains a sewage filtration procedure, the steps of the sewage filtration procedure include: (a) first open the sewage filter tank water purification drainage pipe, and close the filter sand cleaning tank intake pipe, sand outlet pipe, the reverse wash blast pipe, and the sludge discharge device; (b) then open the sewage inlet pipe of the sewage filter tank so that an external sewage enters the sewage filter chamber; (c) the sewage flows up through the water pressure to the water purification drain; and (d) the light filter sand gathers above the sewage filter chamber, The light filter sand and filter sour impurities into the sewage that flows up the stream, which is filtered into clean water and discharged through the water purification drainpipe, and (e) the solid impurities absorbed by the light filter sand settle into the bottom of the sewage filter chamber to form sludge for discharge using the sludge discharge device.
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