An additive manufacturing device utilizing an electron beam and laser integrated scanning, comprising: a vacuum forming chamber; a worktable means having a forming region at least provided in the vacuum forming chamber; a powder supply means configured to supply a powder to the forming region; at least one electron-beam emission focusing and scanning means and at least one laser-beam emission focusing and scanning means, the laser-beam emission focusing and scanning means being disposed outside the vacuum forming chamber and configured to emit a laser beam into the vacuum forming chamber, the electron-beam emission focusing and scanning means and the laser-beam emission focusing and scanning means being configured in such a manner that a scanning range of the electron-beam emission focusing and scanning means and a scanning range of the laser-beam emission focusing and scanning means cover at least a part of the forming region; and a controller configured to control the electron-beam emission focusing and scanning means and the laser-beam emission focusing and scanning means to perform a powder integrated-scanning and forming treatment on the forming region; characterized in that a scanning area of the electron-beam emission focusing and scanning means and a scanning area of the laser-beam emission focusing and scanning means at least partially overlap, the powder integrated-scanning and forming treatment comprises scanning, heating, sintering and melting the powder via an electron beam emitted by the electron-beam emission focusing and scanning means and scanning, heating, sintering and melting the powder via the laser beam emitted by the laser-beam emission focusing and scanning means, and the controller is configured to control the electron beam emitted by the electron-beam emission focusing and scanning means and the laser beam emitted by the laser-beam emission focusing and scanning means to simultaneously or alternatively perform the scanning on the powder in a same area or different areas in the forming region with a focusing spot. a vacuum forming chamber; a worktable means having a forming region at least provided in the vacuum forming chamber; a powder supply means configured to supply a powder to the forming region; at least one electron-beam emission focusing and scanning means and at least one laser-beam emission focusing and scanning means, the laser-beam emission focusing and scanning means being disposed outside the vacuum forming chamber and configured to emit a laser beam into the vacuum forming chamber, the electron-beam emission focusing and scanning means and the laser-beam emission focusing and scanning means being configured in such a manner that a scanning range of the electron-beam emission focusing and scanning means and a scanning range of the laser-beam emission focusing and scanning means cover at least a part of the forming region; and a controller configured to control the electron-beam emission focusing and scanning means and the laser-beam emission focusing and scanning means to perform a powder integrated-scanning and forming treatment on the forming region; characterized in that a scanning area of the electron-beam emission focusing and scanning means and a scanning area of the laser-beam emission focusing and scanning means at least partially overlap, the powder integrated-scanning and forming treatment comprises scanning, heating, sintering and melting the powder via an electron beam emitted by the electron-beam emission focusing and scanning means and scanning, heating, sintering and melting the powder via the laser beam emitted by the laser-beam emission focusing and scanning means, and the controller is configured to control the electron beam emitted by the electron-beam emission focusing and scanning means and the laser beam emitted by the laser-beam emission focusing and scanning means to simultaneously or alternatively perform the scanning on the powder in a same area or different areas in the forming region with a focusing spot.