A plant for handling live poultry in a slaughterhouse, wherein the poultry is sent to the slaughterhouse inside transport units (1) that include two piles set side by side of drawer-type cages (2) arranged on top of one another carried by supporting frames (10) in such a way that they can be slid in and slid out. The plant comprises an input station (3) for input of the transport units (1) where all the drawer- type cages (2) arranged on top of one another of both of the piles are simultaneously extracted each supporting frame (10).