The present invention relates to a multi-coupling device of the plate type for the simultaneous connection of a plurality of hydraulic, electric and pneumatic lines through quick couplings.The device according to the present invention is characterized in that it comprises bayonet coupling means which allow the coupling of the two plates by means of the relative sliding of the mobile plate with respect to the fixed plate.By virtue of the presence of a dedicated hydraulic circuit which connects the female couplings of the fixed plate to one another, the multi-coupling device according to the present invention allows to separate the step of coupling of the plates from the step of hydraulic connection of the male and female couplings.