A needle free dosing device comprises a conical cover, a check block and a base, wherein the check block is attached to the upper end of a cylinder and is integrally provided with a stop wall, and only one side of the cylinder is provided with an elastic gap, so that the bottom of the stop wall can be completely supported by the cylinder. When the check block is compressed and rebounds and resets, the average rebound of the stop wall can be achieved through the cylinder. Support, and then put the retaining wall against the step inlay of the inner wall of the holding tank, and at the same time, stick to the inner wall to prevent the medicine liquid from flowing out against the current.一種免針加藥裝置，其包含：一錐形蓋、一逆止塊以及一底座，其中該逆止塊係於一圓柱體上端一體設有一擋止垣，並僅於圓柱體一側設有一彈性缺口，令該擋止垣底部可完全受到圓柱體的支撐，當該逆止塊受壓縮後回彈復位時，俾能透過圓柱體將擋止垣平均回彈撐起，進而將該擋止垣確實頂靠於容槽內壁之階嵌部，同時貼合內壁，達到防止藥液逆流漏出者。
