The invention relates to a stuffing/dosing machine comprising a tilting hopper. The machine comprises a hopper with a hermetic cover bearing a screw feeder and a narrowed base which communicates with an antechamber, said antechamber communicating in turn with at least one forming chamber which is connected to an outlet. Moreover, at least one actuated piston performs a stroke with one first section in the antechamber and a second section in the forming chamber. First and second structural units, which are formed respectively by the aforementioned hopper, cover, screw feeder and narrowed base and by said antechamber, forming chambers, pistons and actuation means, can be tilted independently between operating positions and cleaning and maintenance positions in relation to fixed frame comprising the valve and the outlet.