The utility model discloses a special explosive barrel that adds of black powder, including closed container, install into medicine valve and discharge valve on closed container, advance the medicinevalve and connect 25# black powder bucket at a distance, install an air duct in closed container, the air inlet of air duct is connected with the admission valve, and outside the admission valve was located closed container, lower part in closed container was stretched into to the gas outlet of air duct, be provided with with the medicine valve in closed container's lower part. The utility model discloses an adopt closed container to make 25# special explosive barrel that adds of black powder, messenger 25# black powder molecule is not favorable to improving the operation environment in can not giving off the air, avoids taking place the toxic incident of workman, overcome the influence that receives liquid level variation with the dose simultaneously, the flow was invariable naturally when the closed container lower part was followed with the play of medicine valve flow to liquid, have advantages such as simple structure, compactness, with low costs, convenient to use, very easily realize industrial application.