Chengdu Institute of Cultural Relics and Archaeology excavated 60 tombs of the late Warring States period at Feihu Village of Pujiang in 2016, and unearthed a total of 181 bronzes. Among them, from M39, was a bronze belt hook with serious corrosion, on which decorative patterns could not be distinguished. In order to restore its historical, artistic and research value, it is necessary to remove the corrosion on its surface. In this paper, several instruments—X-ray computed radiography system, stereomicroscope, metallographic microscope, scanning electron microscope-energy dispersive spectrometer and X-ray diffractometer—were used to analyze the preservation status, material and corrosion products of the belt hook. The results show that there are exquisite gold and silver decorative patterns distributed on the belt hook, and that gold and silver are used alternately. The substrate with belt hook is poorly preserved and seriously rusted. Gold and silver filaments have fallen off in some areas. The surface is seriously corroded, and cracks exist in some areas. The matrix of the belt hook is cast in lead-tin bronze, with a copper content of 73.0%, a tin content of 11.4% and a lead content of 13.7%. The inlaid gold and silver wire samples are inverted triangles, which were all hot-forged. The gold content of gold wire is 88.8% and the silver content is 11.2%. The silver content of silver wire is 95.8%, and the copper content is 2.4%. The corrosion of belt hook is roughly divided into two layers, the outermost green rust is malachite, and the inner red rust is chalcopyrite. On the basis of scientific understanding of the state of preservation, materials and corrosion products of the belt hook, a technical route of chemical strengthening, mechanical and chemical methods for derusting, chemical strengthening, corrosion inhibition and sealing, and adhesive patching were adopted to protect and repair the belt hook. Paraloid B72 ethyl acetate solution with good permeability and slight color change was selected for small cracks, and a small number of injections were used for reinforcement. Hxtal NYL-1 (Hipstar) two-component epoxy resin with good bonding strength and proper permeability was used for the larger cracks, and a small needle tip was used to infiltrate into the cracks for reinforcement. For the green corrosion on the outer layer, a water solution of disodium EDTA was first used to soften it, and then a mechanical method was used to scrape and remove it. Dark red cuprous oxide corrosion on the inner layer was softened in an aqueous solution of cystein, and then scraped off by a mechanical method. At the same time, in the process of removing rust, the loose gold and silver wires were reinforced with Araldite 2020 two-component epoxy resin. After derusting, ultrapure water was used for deep cleaning to remove reagent residues. An ethanol solution of benzotriazole was used for corrosion inhibition, and an ethyl acetate solution of Paraloid B72 was used for sealing treatment. For bonding and patching, first an ethyl acetate solution of Paraloid B72 was used to pre-reinforce the stubble, and then DG-4 epoxy resin matched with glass fiber cloth and a pin was used for bonding and patching. On the basis of fully understanding the nature of cultural relics by using modern instrumental analysis methods, according to the actual situation of cultural relics, various protection and restoration methods were used in a coordinated way. The corresponding remedial measures were formulated, taking into consideration the shortcomings of each method, so as to achieve the purpose of protection and restoration, and to restore the historical, artistic and research value of cultural relics, and minimize the damage to them.