The invention discloses a micro-expansive grouting material for tunnel lining vault mold grouting in order to mainly solve the problems of disengaging, crack and other quality defects of tunnel vaults, caused by easy shrinkage deformation, poor compatibility and poor bonding property of existing like grouting materials. The micro-expansive grouting material is obtained through adding water to 750-800 parts of a gelling component, 900-1350 parts of compounded quartz sands, 100-150 parts of a graphene oxide modified mineral admixture, 8-10 parts of a volume stability regulator and 2-3 parts of areinforced water reducer, and mixing and stirring the above raw materials and the water, wherein a ratio of the water to the total materials is 0.16 to 0.19. The micro-expansive grouting material hasgood fluidity and good pumpability, and has a binding performance with lining concrete, and has significant economic and social benefits in the infrastructure industry.