The invention discloses a recovery technology of an abandoned cleaning agent. The recovery technology is characterized in that the abandoned cleaning agent obtained through collection is subjected to heating, treatment agent adding, mixing, standing, filtration, centrifugal separation, unloading and packing, and the abandoned cleaning agent is substances after a film-forming cleaning agent is used, wherein a treatment agent is a mixture of one or two of sodium polyacrylate and sodium carboxymethylcellulose, and one or several of polyaluminium chloride, polyacrylamide, polyaluminum ferric chloride, aluminum sulfate and white alum. The problem that the conventional cleaning agent is high in recovery cost or the recovery technology complicated is solved; the effect that the abandoned cleaning agent, after treatment processes like heating, treatment agent adding, mixing, standing, filtration and centrifugal separation, reaches a cleaning agent recycling grade directly is realized; with the adoption of the technical scheme, the economic benefit is high, the reduction of environmental protection pressure resulting from cleaning agent waste water is facilitated, and the cleaning cost is reduced.