Semi-automatic bottle blowing machine adopts direct pressure, icrocomputer control, two step blowing bottle. The main blow tube blank PET mineral water bottles, beverage bottles, edible oil bottles, pharmaceutical plastic bottles, pesticide bottles, cosmetic bottles, etc. The gas path is designed to separate the gas and blowing, adopting low pressure(0.4-0.8Mpa) mould clamping, mould locking, sealing, stretching and high pressure(3-3.5Mpa) blowing form, and the gas-liquid locking structure,not only ensure the clamping and locking action smoothly, also ensure the safety of mould and blowing quality, as a result can save the bottle perform material.