This exclusive composite bag for chemical fertilizer packaging is made of OPP outer film, optional aluminum film/foil middle layer (can be without middle layer) and PE inner film through multi-layer composite processing, strictly produced in accordance with national solid chemical fertilizer packaging specifications. The material is safe, environmentally friendly, odorless, with strong acid and alkali corrosion resistance, which can be directly in contact with chemical fertilizers without residue and no impact on fertilizer efficiency. The bag body has been thickened to have excellent tensile, tear and puncture resistance, which can easily bear 5-20kg chemical fertilizer weight, suitable for long-distance transportation and stacking storage; The double sealing technology of heat sealing, cold cutting and precision sewing ensures tight sealing of the bag mouth, effectively isolating moisture and oxygen, preventing fertilizer from getting damp, caking, leakage and nutrient volatilization. The multi-specification and multi-bag type design fully covers various use scenarios such as agricultural material manufacturers, dealers and growers.