A barn-type poultry farming system comprising, on a supporting frame, at least one multistorey battery (11) of farming cages (12). At one side of the multistorey battery (11) there is an inspection corridor (13) and at the other side there is a free area (14) on which the poultry can walk and for transit to cages of different farming levels (18, 19, 20, 21), the cages (12) being open and provided with perches (15, 22) on the side directed toward the free area (14).