Fluid pump device

A fluid pump device comprising:

• a fluid storage barrel including a fluid accommodation chamber and an air chamber which is one-piece formed with and is separated from and surrounded by the fluid accommodation chamber;
• a cap mounted on a top of the fluid storage barrel and configured to close the fluid accommodation chamber and the air chamber, wherein the cap includes a connector configured to connect with a fluid delivery tube and communicating with the fluid accommodation chamber, an air conduit communicating with the fluid accommodation chamber and the air chamber, and a check valve communicating with the air conduit;
• and
• a manual pumping mechanism including a press stem extending through the cap and the air chamber, an operation lever mounted on a top of the press stem, and a one-way piston connected on a bottom of the press stem, wherein the fluid storage barrel includes a single-way discharge valve fixed on a bottom of the air chamber.