Abstract: Device per preparing in advance magazines (21) for films to be introduced in a film developing machine, comprising a flat table (32) provided on the upper part of the preparation station (27) of the machine, which is shaped with a set of seats adapted to house the materials and the tools provided to join the films to be developed, which are either contained in their rolls in the case of films of size 135 or introduced in a suitable container (67) in the case of films of different sizes, with the associated leader (63).Such joining, in particular, is carried out directly on the magazine (21) which rests on a suitable seat of the flat table (32).Each so prepared magazine is inserted in the loading station (23) of the film developing machine, where the file is fully unrolled therefrom and, in the case of film of size 135, also cut at its terminal end.