The invention discloses an infusion device comprising a liquid medicine container which is used for containing liquid medicine, one end of an infusion tube is communicated with the liquid medicine container and used for transporting the liquid medicine in the liquid medicine container into human body, a needle which is arranged on the end part of the infusion tube, and a check valve which is arranged on the infusion tube. The infusion device has the beneficial effects that: the infusion device can conveniently adjust the infusion speed, prevent the situation that the infusion speed is out of control caused by looseness of an adjusting device and prevent the pollution caused by the reflux of the liquid medicine and blood during the infusion process and when the infusion is completed.