The utility model provides a high pressure gas cylinder for a gas delivery vehicle, which comprises a cylinder section, two openings and seal heads, wherein the cylinder section is positioned at the middle part of the high pressure gas cylinder; the two openings are respectively positioned at both ends of the high pressure gas cylinder; and the seal heads are used for connecting the cylinder section and the openings. The wall of the high pressure gas cylinder sequentially comprises a liner, a combining coating, a composite material layer and an outer protective film from inside to outside, wherein the liner is made of steel; the combining coating is made of polyurethane material; and the composite material layer is made of glass fiber-epoxy system composite material. The high pressure gas cylinder mainly has the benefits that due to the adoption of the liner made of the steel and the glass fiber-epoxy system composite material layer, the high pressure gas cylinder has good fatigue property and impact resistance and the special requirements of the high pressure gas cylinder for the gas delivery vehicle are met; and the composite material layer is wrapped with the outer protective film, so that the outer surface of the composite material layer is protected from being eroded by moisture in the air and substances with corrosion property to influence the property of the gas cylinder.