The work aims to study the corrosion mechanism and protection technology of ammunition metal packaging materials, as the corrosion of ammunition metal packaging material causes very serious damage, which not only shortens the service life of weapons and equipment, but also causes accidents such as blast. Taking the corrosion mechanism analysis of ammunition metal packaging material as the starting point, reasonable suggestions were provided for the anti-corrosion method of ammunition metal packaging materials in combination with the existing metal anti-corrosion technology. When the ambient humidity for storage was up to 60%, the corrosion rate of several common ammunition metal packaging materials was obviously accelerated, the corrosion rate of iron was greater than that of copper, and the corrosion rate of copper was greater than that of aluminum. The main reason for the corrosion of ammunition metal packaging material is electrochemical corrosion, while the high humidity and heat, marine environment, rough surface state and high internal stress all worsen the corrosion. Material technology, surface coating technology, sealing and anti-corrosion technology and nanotechnology can effectively solve the corrosion problem of ammunition metal packaging materials.