The invention relates to a corner brace assembling method for tile packaging and a device thereof. The device comprises a rack, an arc-shaped bending corner brace storage bucket arranged on the rack and a drawing and pushing device arranged at the outlet of the arc-shaped bending corner brace storage bucket, and is characterized in that a corner brace pushing-up device is arranged at the arc-shaped bending corner brace storage bucket of the corner brace storage bucket and comprises a push head and a power mechanism driving the push head to move. Compared with the prior art, the invention has the advantages that the corner brace can smoothly reach the outlet of the corner brace storage bucket and can then be smoothly taken out.