The invention belongs to the technical field of document preservation, and relates to a paper document quality guarantee processing device. A main structure of the paper document quality guarantee processing device comprises an atomizing chamber, an atomizer, a liquid storer, a power supply, an atomizing pump, document quality guarantee liquid, a document support clamp, a document, an air inlet, an air outlet, a liquid storer cover, an electrode, an atomizing nozzle and an atomizing chamber door; the processing device is used; the document quality guarantee liquid is atomized and attached on the document through spraying the atomized document quality guarantee liquid to the document in the atomizing chamber, and solvent thereof can be quickly cured to form a layer of document quality guarantee liquid film after evaporation, so that the document quality change and damage and the writing fading are effectively prevented, the insect corrosion resisting effect is achieved, the long-time document quality guarantee preservation is realized, and in particular, the writing on the document cannot fade or mutually bonded; and the device is simple in principle, reasonable in structure, excellent in use effect and long in quality guarantee period.