The slow release rate of pure copper in the mixed solution was tested by putting a volume of 0, 100, 200, 300, 400, 500 mL homemade PVA metal antirust liquid into acid medium HCl with concentration of 1.0 mol/L based on weight-loss method, polarization curve method and surface analysis of scanning electron microscope (SEM). The weight loss method showed that PVA water-soluble metal antirust liquid exerted a better corrosion inhibition on pure copper. With the increase in the volume of antirust liquid, the weight loss decreased with a better corrosion inhibition effect as the corrosion rate was 86.7%; Polarization curve method suggested that PVA water-soluble metal antirust liquid demonstrated good corrosion inhibition on pure copper, and with the increase in the volume of antirust liquid, the corrosion current of the system decreased with the anti corrosion rate being 85.9%; Scanning electron microscope (SEM) surface topography analysis indicated that the increase of antirust liquid resulted in the decrease in the number of holes on the surface of pure copper with the reduced cavern area. With 500 mL antirust liquid added, pure copper surface tended to smooth, suggesting that antirust liquid of pure copper had good corrosion inhibition effect.