Abstract: Fixing system enabling in particular a structure (10) to be rapidly docked for securing thereon an element in a detachable way.According to the invention, this system is notable in that it comprises:pliers (3) able to be spontaneously opened under the action of a first spring (7);a rod (14) able to slide under the action of a second spring (13) so as to close said pliers against the action of said first spring (7);a mobile support (15) for said second spring (13);locks (19, 20, 21) able to be controlled for locking said sliding rod (14) and said mobile support (15);and a pin (23) to control at will the blocking of said locking means.The system is used for the fixing of an element onto a structure in difficult conditions, for example outside a spaceship.