The invention discloses a high-density bubble-free golden finger pressing structural slab and a processing method thereof. The high-density bubble-free golden finger pressing structural slab comprises a first covering film, first copper foil, a first PI base material, a prepreg, a second covering film, a golden finger, second copper foil, a second PI base material, third copper foil and a third covering film. The materials are connected in a pressing mode through adhesive films. According to the high-density bubble-free golden finger pressing structural slab and the processing method thereof, the height difference between the golden finger and the covering film on the surface layer is greatly reduced, bubbles are not likely to be generated in the golden finger pressing process, and the rate of finished products is greatly increased.