In view of the problems that the propellant grain bagging relies on manual operation, the man-machine is not isolated, and there are potential safety hazards, on the basis of the automatic packaging technology of civil products, the appropriate automatic packaging equipment is selected to carry out the corresponding technical transformation to realize the automatic packaging of propellant grain. The advantages and disadvantages of two kinds of automatic packaging equipment used for propellant grain inner packaging were compared, the transformation points were determined, the corresponding technical transformation was carried out, and the actual production verification was passed. The application results show that the improved equipment can successfully realize propellant grain bagging, and the potential safety hazards are eliminated.