The invention discloses a
drug infusion device without half-pressing, comprising: a
drug storage
barrel for containing drugs, a
piston and a screw being arranged in the
drug storage
barrel; a driving wheel connected to the screw, and driving the
piston forward by rotating the driving screw; an infusion needle unit, the infusion needle unit comprising an infusion needle and a needle seat, the needle seat being used to fix the infusion needle, the infusion needle unit being in a middle position when leaving the factory, and the infusion needle being connected to the
drug storage barrel; an
adhesive patch for sticking the infusion device to the
skin surface; and a safety base being arranged below the
adhesive patch, an infusion needle accommodating portion being arranged on the safety base, and the infusion needle accommodating portion being waterproof and breathable. The infusion needle unit of the
drug infusion device is in a middle position when leaving the factory, and the user does not need to half-press the needle seat to the middle position before performing subsequent operations, thereby reducing the user's operation steps, and the filling can be completed during the drug filling process, thereby avoiding the waiting for filling, shortening the user's
operation time, and greatly improving the user experience.