The invention discloses a crowner head of an overlay on the bottling line of beverage. The roller in the crowner head is supported on the side of a connecting frame by a small shaft, the lower end of the connecting frame is connected with a spool by a connecting rod, and a sleeve is sleeved on the periphery of the spool; the upper end of a core shaft stretches into the inner hole of the spool andis capable of sliding in the inner hole, the lower end of the core shaft stretches out and is provided with a container cap at the end part, and the shape of the container cap is matched with the shape of the overlay; the periphery near to the lower end of the core shaft is provided with a positioning bump, a supporting spring is arranged between the positioning bump and the lower end face of thespool, and a spacing mechanism is arranged between the core shaft and the spool; and an air hole is arranged on the sleeve and is connected with a negative pressure source externally, and a suction channel is formed between the core shaft and the container cap. In the invention, the overlay is sucked by a set of vacuum suction mechanism, thereby having high efficiency and stable and reliable work; the whole capping machine operates along the guide slot in a cam mechanism, the capping process is completed by utilizing the pressure of the spring, and the spring force is balanced and adjustable,thereby having no damage on the overlay.