The invention provides special adhesive resin for a polyvinyl chloride corrosion-resistant steel tube with a barrier property. The resin comprises the following components in parts by weight: 20-30 parts of an ethylene-vinyl acetate copolymer, 15-20 parts of maleic anhydride-grafted polyvinyl chloride, 15-20 parts of maleic anhydride-modified polypropylene, 10-15 parts of polyurethane-modified epoxy resin, 10-15 parts of tripolyphosphoric acid-modified polyvinyl alcohol resin, 10-15 parts of terpene resin, 5-10 parts of filler and 0.1-0.5 part of an antioxidant. The invention also provides a preparation method of the special adhesive resin for the polyvinyl chloride corrosion-resistant steel tube with the barrier property. The adhesive resin for the polyvinyl chloride corrosion-resistant steel tube with the barrier property has a good adhesive property on a polar material, has relatively high shear strength and relatively good low-temperature resistance, has relatively high peeling strength in a relatively wide temperature range, and is wide in application range.