The invention discloses a PE-CAV assisted SPS sintering method for preparing a graphene-reinforced titanium-based composite material, and belongs to the technical field of graphene-reinforced titanium-based composite materials. The method aims to solve the technical problems that graphene is difficult to uniformly disperse in a titanium alloy matrix and an interface reaction is difficult to control in the preparation of the graphene-reinforced titanium-based composite material by an existing method, thereby further solving the bottleneck problem of the inverted strength and plasticity(toughness) of titanium-based composite materials. The method comprises the following steps: first, growing graphene in situ on the surface of spherical titanium alloy powder by a PE-CVD technology; secondly,deforming the Gr/Ti composite powder into a flake shape by using a mechanical ball milling process; and thirdly, preparing the bionic micro-nano layered Gr/Ti composite material by using a low-temperature rapid discharge plasma sintering technology. A reinforcing body of the composite material prepared by the method disclosed by the invention is uniformly dispersed, and has strong interface bonding and excellent comprehensive mechanical property.