The invention relates to a hoop plate, in particular to a hoop plate of a bag making machine, and belongs to the technical field of bag making machines. The hoop plate comprises a connecting plate. Two film pressing plates are slidably connected to the connecting plate. Two film pressing grooves are respectively formed in the opposite sides of the two film pressing plates. Each of the two ends of the connecting plate is connected with one support shaft through a bolt. The lower end of each support shaft is connected with a fixing seat through a bolt. Each fixing seat is slidably connected with a machine body wall plate. The hoop plate is simple, compact and reasonable in structure, convenient to use, low in cost and applicable to film guidance during hot sealing of the bag making machine, deflection is avoided, and production efficiency and product quality are improved.