Construction method for middle-arranged connection type glass-magnesium composite board split air return passageway

The invention discloses a construction method for a middle-arranged connection type glass-magnesium composite board split air return passageway. A 0.5mm composite board is selected and bent into two 50 * 79 * 50mm bent pieces on a bending machine, the length of the bent pieces is determined according to the board length, two 9.5mm gypsum boards are cut, namely the gypsum board A7 and the gypsum board B3, and the gypsum boards can be placed into the bent 10mm composite board. According to the glass-magnesium composite board split air return passageway with the middle-arranged connection type, glass fibers serve as a reinforcing material, magnesium oxychloride cement serves as a cementing material, air pipe boards are produced through machining and bonded to the air return passageway, the split air return passageway is completely produced in a factory, the modular production requirement is rechecked, the installation method is consistent with that of a common wallboard, and labor is saved; and the split air ret