Device (96), for extrusion and manufacturing of an alimentary paste, characterized in that comprising: - a machine body (34), containing inside two elements (21) and (26) working as a unique block and strongly jointed to said machine body (34), so that the three elements (34), (21 ) and (26) represent an airtight and closed structure; a piston (26), that together with said element (21) defines a structure able to express a mechanical force towards the direction of the lower container (42) that contains an alimentary paste; - an extrusion pipe (92), connected at the base of said container (42), and including a proper dosage valve (69); an external supply circuit (97), suitable to define the correct level of pressure inside said airtight structure, according to different functional steps, so that it is possible a controlled extrusion of an alimentary paste, like i.e. almond/pistachio paste and/or similar products, from said extrusion pipe (92).