本发明提供了一种内表面光滑的LPBF镁合金组织工程支架制备方法及系统，包括：步骤S1：对多孔支架进行扫描，筛选出最致密的填充扫描参数；所述扫描包括单道次轮廓扫描和单次填充扫描；步骤S2：根据最致密的填充扫描参数，优化轮廓扫描策略；步骤S3：获取对应的熔池尺寸，使用优化后的轮廓扫描策略调整光斑补偿值；步骤S4：基于轮廓扫描策略及调整后的光斑补偿值制备镁合金组织工程支架。本发明能在制备过程中原位消除复杂多孔结构的内部严重影响内表面粗糙度和支架性能的粘粉和挂渣缺陷，提高了多孔支架的流通性、疲劳和耐腐蚀性能，简化繁琐后处理流程，降低了生产成本，实现了绿色生产的理念。

This invention provides a method and system for preparing a LPBF magnesium alloy tissue engineering scaffold with a smooth inner surface, which includes: Step S1: Scanning the porous scaffold to select the most dense filling scanning parameters; the scanning includes single pass contour scanning and single filling scanning; Step S2: Optimizing the contour scanning strategy based on the most dense filling scanning parameters; Step S3: Obtaining the corresponding melt pool dimensions, and adjusting the beam compensation value using the optimized contour scanning strategy; Step S4: Preparing the magnesium alloy tissue engineering scaffold based on the contour scanning strategy and the adjusted beam compensation value. This invention can in situ eliminate internal defects such as adhesion and dross that severely affect the inner surface roughness and performance of the scaffold during the preparation process, improving the permeability, fatigue, and corrosion resistance of the porous scaffold, simplifying the tedious post-processing procedure, reducing production costs, and realizing the concept of green production.