The invention discloses a blood-drawing auxiliary device for the internal medicine of hematology. The blood-drawing auxiliary device comprises a base plate, wherein a control switch is arranged on the front side surface of the base plate, a fixed base is fixed to the left side of the upper surface of the base plate, a hinge base is fixed to the upper surface of the base plate on the right side of the fixed base, and a hinge plate is hinged to the upper end part of the hinge base. The blood-drawing auxiliary device for the internal medicine of hematology is reasonable in structural design, and easy and convenient to use, the forearm of a patient is placed on a fixing cushion and then the hand of the patient holds a handle, so that the unconscious shaking during the blood drawing process can be prevented, the work difficulty in blood-drawing examination of a doctor is reduced, and the discomfort of the patient is alleviated; a drawer can be used for placing medicinal cotton and is close to the medical staff, thus taking is convenient, the vein belt can be automatically bound and pressed, the hinge plate rotates under the driving of an electric telescopic rod, so that a vein-pressing belt is tightened to bind the arm of the patient, therefore, convenience is provided for blood drawing, the work efficiency in blood-drawing examination of the doctor is greatly improved, and the workload of the medical staff is alleviated.