Based on the working requirements of intelligent pharmacy for intravenous drugs, a set of safe delivery device for intravenous drugs was designed. With typical ampoules for intravenous drugs as the research object, a passive conveyor belt delivery mode was determined based on the analysis of safe delivery requirements and theories, and the characterization parameters of safe delivery judgment and the mechanical structure design of safe delivery device were given. The results showed that the shape variable was the largest and the safety factor was the lowest when the drug with the largest size was in contact with each other. When the ratio of diameter to height of the drug was larger and more spherical, the shape variable changed less with the increase of speed, and the safety factor decreased more slowly. Therefore, the medicine bottles of different specifications can be delivered in layers according to the actual working conditions. When the speed of the designed medicine delivery device was lower than 5.5 m/min, the maximum drug delivery speed was about 250 bottles/min, which can be safely delivered. And the device can be further applied in the material supply and sorting combined packaging production line.