The invention discloses a microalloying synergistically strengthened graphene titanium-based composite material. The microalloying synergistically strengthened graphene titanium-based composite material takes titanium or titanium alloy as a matrix, metal for microalloying is uniformly coated on the surface of the titanium or titanium alloy matrix in a quasi-continuous manner through a physical bonding manner, graphene is dispersed on the outer surface of the metal-coated titanium or titanium alloy matrix for microalloying, the graphene is dispersed on the outer surface of the metal-coated titanium or titanium alloy matrix, the graphene, in-situ synthesized TiC nanoparticles and intermetallic compound particles jointly form a quasi-continuous net structure; and the invention further discloses a preparation method of the microalloying synergistically reinforced graphene titanium-based composite material, and the preparation method comprises the following steps of ball milling the raw material powder, uniformly stirring with the graphene nanosheet suspension solution, drying, and carrying out hot pressed sintering. According to the microalloying synergistically strengthened graphene titanium-based composite material and the preparation method thereof, microalloying metal coating is adopted, so that direct contact between graphene and the matrix is avoided, the distribution uniformity and structural integrity of the graphene are improved, the graphene, TiC nanoparticles and intermetallic compound particles have a synergistic reinforcing effect; and the method is high in operability, and the microalloying synergistically strengthened graphene titanium-based composite material is suitable for industrial production.