The invention provides an automated apparatus of cell culture having tanks of culture medium, of growth factors and of cells to be cultured, an incubator having a thermostated enclosure which houses a cell culture vessel, and control computer system. A supporting and agitation device of the culture vessel is provided in the enclosure, and the culture vessel is formed by a bag having at least one inlet port connected to the tanks and one outlet port connected devices for harvesting and storage of the cells after culture, these harvesting and storage devices and tanks being located outside the enclosure and being connected to the cell expansion bag ports by conduits which together with the cell expansion bag form a preassembled module passing through a wall of the enclosure.