The invention provides a method for improving the sintering performance by using a nanocarbon material during laser preparation of a polymer-ceramic bone scaffold, and belongs to the technical field of rapid laser formation of composite bone scaffolds. In allusion to the problem that the sintering performance of a composite material decreases because silicate bioceramic and polyglycolide are difficult to form relatively strong interface bonding in the laser sintering process, the invention provides a method for improving the sintering quality by using the nanocarbon material as a nucleating point for the crystalizing process in the laser sintering process to promote nucleation of the polyglycolide. The method comprises the following specific steps: using a mixture of the polyglycolide, the silicate-based bioceramic and the nanocarbon material as a raw material, designing a porous structure and an individual shape of the scaffold by using computer-aided design software, uniformly mixing powder by a magnetic stirring and ultrasonic dispersing technology, filtering and drying to obtain composite powder, and then preparing the porous bone scaffold by a rapid laser forming technology.