The invention discloses a low-temperature boron-free starch adhesive for paper products and a preparation method thereof. The components and parts by weight of the adhesive are: 100 parts of corn starch, 320-400 parts of water, and 2.3-400 parts of potassium permanganate. 2.6 parts, 0.5-0.8 parts of sodium fatty acid, 2-2.4 parts of oxalic acid, 0.3-0.5 parts of tributyl phosphate, 8-12 parts of sodium hydroxide, 1.2-1.8 parts of sodium trimetaphosphate, 3-5 parts of drier, The adhesive with this formula has a simple production process and does not require heating. It only takes 40-50 minutes from feeding to the finished product. The adhesive cartons dry quickly, have high strength, do not run rough, do not absorb moisture, do not flood, and do not pan-alkali , long storage period, the viscosity remains unchanged after storage for 3 months, no mildew and precipitation, initial adhesion is 1-1.5min, full adhesion is 5-10min, fiber damage is 30-50s, the relevant physical and chemical indicators are better than the national standard requirements, and can be widely used Corrugated boxes for general commodity packaging and corrugated boxes for food packaging.