The invention discloses a method for automatically determining the puncture point position, and belongs to the technical field of medical treatment. The method comprises the steps that by obtaining across section image model of a human body upper limb blood vessel, according to the cross section image model of the human body upper limb blood vessel, each blood vessel in an upper limb intravenousultrasound image of a patient going to be punctured is identified and marked, the position, in the upper limb intravenous ultrasound image of the patient going to be punctured, of the center a cross section image of a target vessel is obtained, and according to the position, in the upper limb intravenous ultrasound image of the patient going to be punctured, of the center the cross section image of the target vessel, a scale of the upper limb intravenous ultrasound image of the patient going to be punctured and the puncture angle of an indwelling needle, the physical position, at the puncturepoint on the skin surface of the patient going to be punctured, of the indwelling needle is obtained; a nurse does not need to determine the position of the puncture point on the skin surface of the patient through eye view and hand touch, and then the phenomenon that when puncture is conducted, the selected position of the puncture point is unreasonable or the target vessel cannot be found is avoided.