The invention relates to a device for producing a large-area, pre-fabricated wall part (2), in particular comprising at least one concrete layer (1), on a movable form pallet (3) having a turning device (4), which can be connected to the form pallet, for turning the form pallet (3), wherein the turning device (4) has a clamping device (5) having at least one holding element (6), wherein the holding element (6) is arranged around a swivel axis (8), which extends substantially parallel to a surface (7) of the form pallet (3), in a swiveling manner on the clamping device (5), wherein, by swiveling the holding element (6) around the swivel axis (8) thereof, one end (9) of the holding element (6) can be pressed on the pre-fabricated wall part (2), wherein the pre-fabricated wall part (2) can be fastened to the form pallet (3) in a position-stable manner, wherein, in order to fasten pre-fabricated wall parts (2) of differing thickness to the form pallet (3), the clamping device (5) is movably arranged on the turning device (4), wherein a distance (10) between the turning device (4) and the swivel axis (8), extending substantially perpendicular to the swivel axis (8), can be adjusted for the holding element (6).