An intraoral scanning device and a scanning method are provided. The device includes a projector, a cube splitting module, a reflection module, an image sensor and a processor. The projector projects a line laser. The cube splitting module is disposed on a projection path of the projector. The reflection module is disposed on a side of the cube splitting module opposite to the projector, and is disposed on the projection path of the projector for reflecting the line laser to an object. The object is disposed on an image sensing path of the image sensor, and the image sensor captures an image corresponding to the object. The processor build a three-dimensional tooth module according to the image.本發明一種口內掃描裝置與掃描方法。此裝置包括投射源、立分光模組、反射模組、影像感測器與處理器。投射源用以投射出線雷射。立分光模組設置在投射源的投射路徑上。反射模組設置在立分光模組相對於投射源的另一側且在投射源的投射路徑上，用以將線雷射反射至物體。上述的物體位於影像感測器的影像感測路徑上，影像感測器用以擷取對應物體的影像。處理器用以根據影像建立對應物體的立體齒模。
