The fluid filling system according to the present invention consists of a supporting structure containing at least one container, equipped with at least one socket (2) with at least one single branch pipeline (11) and terminated by a stop valve (4). The fluid filling system van be further equipped with at least one hollow drive-up element (5) from elastic material filled with fluid and equipped with at least one safety valve (7) leading into the pressure tank whose at least one inlet with back pressure valve preferably equipped with a reduction valve, leads into a container whose filling socket (2) is equipped with a lid or a back pressure valve.