In one aspect, the invention discloses a cleansing agent for vitrifying-polished floor tiles. The cleansing agent includes, by weight, 4 parts of potassium hydroxide, 5 parts of sodium hydroxide, 1 part of sodium chloride, 4 parts of sodium carbonate, 3 parts of sodium phosphate, 2 parts of sodium tripolyphosphate, 2 parts of ethanol, 1 part of isopropyl alcohol, 6 parts of sodium dodecyl benzene sulfonate, 12 parts of alkylolamide, 6 parts of sodium silicate, 6 parts of sodium sulfate, and 5 parts of sodium silicate. The cleansing agent has simple preparation technology and is convenient to use, is used for cleaning toilets and dredging sewer pipes, has the effects of dredging, sterilization, deodorization, scale prevention and cleaning, and is effective in deodorization.