Sterilization composition used for surface of historical relics

The invention belongs to the field of historical relics protection, discloses a surface antiseptic for protecting and repairing a historical relic material, and concretely relates to a sterilization composition used for surface of historical relics containing an isothiazolinone compound (0.1-5.0%), a high-molecular guanidine salt compound (0.05-5.0%), double long-chain quaternary ammonium salt (0.05-6.0%), a nonionic surfactant (0.1-2.0%), and the balance of a solvent. The sterilization composition has the advantages of reasonable ingredient, environmental protection and low toxicity, and good antibiosis effect, compared with the simple superposition of the ingredient activity, the antibiosis effect has obvious synergy effect, the fast-acting property is good, and the persistence is long. The sterilization composition has wide control scope for microbes, and has effects on actinomyces, lichen, bacteria, fungi and algae. The combination accords with a principle of no change of a protection original state of cu