The invention relates to a device for portioning flowable food products, consisting of: a first group of cylinders (1) comprising pistons (3) which communicate with a chamber (5) having an inlet (5a) and an outlet (5b); a second group of cylinders (2) comprising pistons (4) which communicate with a chamber (6) having an inlet (6a) and an outlet (6b), and dispensing means. Said dispensing means are controlled by synchronisation and control means in order to: alternately communicate a food product inlet (9) with said chamber (5) whereby the cylinders (1) open the inlet (5a) and close the outlet (5b) thereof; and simultaneously communicate an outlet (10) with said chamber (8) whereby the cylinders (2) close the inlet (56a) and open the outlet (6b) thereof and vice versa. Fluid dynamic cylinders (26) actuate each piston (3, 4) consecutively or actuate on sub-groups of pistons (3, 4) consecutively in order to empty the cylinders (1, 2).