Single chamber vacuum packaging machine can be used for vacuum packaging of medium vacuum filling packaging machinery, vacuum packaging bag is pumped into a low vacuum, immediately automatically sealed, due to the high vacuum in the bag, residual air is very little, inhibit the reproduction of bacteria and other microorganisms. Single chamber vacuum packaging machine for meat products, condiments, soy products, medicines, food and other powder, solid, liquid items vacuum packaging, in order to extend the storage period of products, prevent mildew, corruption, moisture purposes.