The invention discloses a dry-hanging device of a stone or a ceramic tile and assembly method thereof, wherein, the drying-hanging device comprises oblique hooking components and a stone or a ceramic tile. The invention has the characteristics that: two oblique hooking components are spliced with each other at the long edges in the direction of external angles and fixed into a dry-hanging component with a V-shaped end as the front end and a fixed end as the back end; the back of the stone or the ceramic tile is cut into a V-shaped groove which can contain the V-shaped end inside, the V-shaped end and the V-shaped groove of the back of the stone or the ceramic tile are correspondingly connected. The assembly method includes the following steps: the back of the stone or the ceramic tile is cut into the V-shaped groove firstly, and an oblique hook of the front end of one oblique hooking component is inserted into the V-shaped groove, and an oblique hook of the front end of the other oblique hooking component is inserted into the V-shaped groove, and the back ends of the two oblique hooking components are fixedly superposed or are fixedly superposed with a connecting fixed piece. The formed dry-hanging device is fixed on a wall surface through the fixed end or the connecting fixed piece, thereby forming structures of various models as vertical hanging, top hanging, suspended hanging, etc. The invention has the advantages of simple construction, convenient use, firm hanging, etc.