Cement-based composite material used for 3D printing as well as preparation method and application thereof

The invention discloses a cement-based composite material used for 3D printing as well as a preparation method and application thereof, and belongs to the field of building materials. The cemented-based composite material comprises the following components in percentage by weight: 19-25% of a composite gel material, 0.2-0.6% of a shrinkage inhibitor, 1-2% of an anti-carbonization agent, 57-66% of aggregates, 0.3-1.1% of fiber-reinforced materials, 0.9-1.8% of a liquid alkali-free accelerating agent, 0.8-1.7% of a retarder, 0.02-2% of a thickening agent, 0.2-0.4% of a plastic retaining agent, 0.04-0.09% of a defoaming agent, 0.04-0.2% of a water reducer and 5-14% of water. A cement product printed by the cement-based composite material has no holes and pitted surface in appearance.