In order to quickly obtain the 3D digital surface of the dental wax, an original design and achievement of a novel digital laser dental scanning system is introduced based on three-axis platform. 3D surface and design of Dental model are implemented by the presented system which integrates optical, mechanical, electronic technologies, data processing technology and so on. The system consists of laser probe, three-axis platform, electronic control system, master computer and system software. 3D point cloud of Dental wax without any blind point can be scanned through controlling line structured light vision sensor and three-axis platform in phase. Experiment demonstrates that the scanning precision of the system is 0.182mm, scanning speed is 8 000 pts/s. Therefore, the system works fast with high accuracy, its operation is simple and flexible, so it can meet requirements of collecting 3D surface of the dental wax.