Building board dry hanging system

A building board dry hanging system is suitable for being installed on a wall and comprises a plurality of vertical components, a plurality of horizontal components and a plurality of dry hanging modules. The vertical members are installed on the wall at intervals in the left-right direction. The horizontal members are installed on the sides, opposite to the wall, of the vertical members at intervals in the top-bottom direction. And each dry hanging module comprises a building board and a hanging piece which is connected with the building board and is embedded and clamped in one horizontal component. And the dry hanging module is hung on the horizontal component, so that the building boards are connected to form a building wall spaced from the wall. The building wall and the wall are matched to define an air flow channel which is communicated with the outside to allow air to flow and can block heat conduction. According to the building wall, sunlight can be effectively prevented from directly irradiating the