The invention discloses a manufacturing system for an A2-level fireproof core board. An unreeling device, a heating device, a combining device, a cooling device, a film attaching device and a trimming and board shearing device are arranged in the forward moving direction of the core board of a combined system in sequence. The total length of the combined system ranges from 50 m to 60 m, and the system speed ranges from 2 m/min to 3 m/min. Compared with a traditional core board manufacturing and combining whole system, the occupied space is reduced by a half, the production efficiency is improved by two times, the ordering demands of different clients are met, more benefit is brought to a manufacturing enterprise, the whole manufacturing system is a whole, the A2-level fireproof core board can be rapidly manufactured, the processes of baking, stripping, rolling and cooling are conducted after materials are prepared, core materials which are liquid state ingredients are baked into a solid sheet shape, the internal density of the core board is increased, and therefore the fireproof strength is improved.