An automatic coupling-decoupling device for a soil working apparatus , in particular an agricultural apparatus or tool, still more particularly a roller, behind or in front of a machine moving on the soil along a longitudinal direction and connected to an energy source, the coupling-decoupling device comprising two hitching structures which make a rigid link together when the device is in a coupled state, characterised in that : ▪ the device comprises a movable frame movably mounted on the machine , ▪ the hitching structures comprise a primary structure with a primary receiving hitching means carried by the movable frame , and a primary received hitching means carried by the apparatus , and a secondary structure comprising a secondary receiving hitching means associated with the machine and a secondary received hitching means carried by the apparatus , ▪ the primary and secondary receiving hitching means are displaceable with respect to each other, ▪ in a docking position of the movable frame and a standby position of the apparatus , the primary structure is capable of reaching by displacing the machine on the soil a mutual docking state of the primary hitching means , corresponding to a docking state of the device, ▪ by displacing the movable frame from the docking state, the movable frame is able to drive the apparatus through the primary structure at least up to a preparatory position for mutually hitching the secondary hitching means , ▪ for displacing the receiving hitching means with respect to each other, one of the receiving hitching means is mounted on an actuating element which is able to be moved at the end of the movement of the movable frame from the docking state, by means of a jack and of a spring , or by means of a double acting jack, so that the mutual hitching of the hitching means is performed by displacing the receiving hitching means with respect to each other. ▪ the device comprises a movable frame movably mounted on the machine , ▪ the hitching structures comprise a primary structure with a primary receiving hitching means carried by the movable frame , and a primary received hitching means carried by the apparatus , and a secondary structure comprising a secondary receiving hitching means associated with the machine and a secondary received hitching means carried by the apparatus , ▪ the primary and secondary receiving hitching means are displaceable with respect to each other, ▪ in a docking position of the movable frame and a standby position of the apparatus , the primary structure is capable of reaching by displacing the machine on the soil a mutual docking state of the primary hitching means , corresponding to a docking state of the device, ▪ by displacing the movable frame from the docking state, the movable frame is able to drive the apparatus through the primary structure at least up to a preparatory position for mutually hitching the secondary hitching means , ▪ for displacing the receiving hitching means with respect to each other, one of the receiving hitching means is mounted on an actuating element which is able to be moved at the end of the movement of the movable frame from the docking state, by means of a jack and of a spring , or by means of a double acting jack, so that the mutual hitching of the hitching means is performed by displacing the receiving hitching means with respect to each other. <EOS>