Vacuum system for collecting food products, the food products moving on one conveyor element, and the collection system executed by vacuum suction of at least one suction duct which transversely intercepts the conveyor element and bears a plurality of holes directed towards the conveyor belt, and elements for controlling the opening or closing of the holes. The suction duct acts as a shutter-valve, i.e. as a suction element, the stems of the cylinders are adapted to directly interfere, that is close or open, the corresponding passage hole on the suction duct. The stems of the cylinders pass inside the suction duct.