Large three-dimensional engraving device

The utility model discloses a large three-dimensional engraving device. The large three-dimensional engraving device comprises PVC expansion sheets (4), a glass bakelite basement layer (7) and a block board basement layer (9). The block board basement layer (9) is laid on a basement layer surface and is fixed through self-tapping screws (10). A metal fixing part (8) is arranged between the glass bakelite basement layer (7) and the block board basement layer (9), and the glass bakelite basement layer (7) and the block board basement layer (9) are mutually fixed through the metal fixing part (8). A plurality of grooves are formed in the glass bakelite basement layer (7) at intervals. The PVC expansion sheets (4) are inserted in the grooves. A metal plate (1) is inserted in the gap between every two adjacent PVC expansion sheets (4). The PVC expansion sheets (4) are engraved with three-dimensional engravings. The surfaces of the three-dimensional engravings are pasted with silver foil (2) through oily foil adhes