Abstract: The invention concerns devices serving to load ammunition in a cannon consisting of a tube comprising a housing and a rotor in which are arranged several recesses distributed uniformly about its axis and each intended to receive a shell, a door which when closed prevents a shell from exiting the tube, a rammer driven by springs cocked by the recoil of the breech and a lock serving to maintain the springs in the cocked position. To enable the automatic sequence of all the shell loading operations at a single command, the device of the invention comprises motors (16, 18, 20) serving to rotate the tube (10) step by step, to open the door of the tube and to lock it in the closed position, and to release the bolt of the rammer (12), means for controlling these motors in a given sequence at a loading order given by the operator and means for detecting a shell exiting the tube and for detecting the closing of the door.