The invention discloses a micron-nano double-scale titanium carbide particle enhanced titanium base composite and a preparing method thereof. The preparing method comprises the steps that after being mixed, oxidized graphene water body dispersion liquid, titanium powder and hydrazine hydrate are sequentially subjected to freezing, drying sublimation and sintering. The mass concentration of the oxidized graphene water body dispersion liquid ranges from 8.5 mg/mL to 15 mg/mL. Each 50 mL of the oxidized graphene water body dispersion liquid is correspondingly mixed with 21-172 g of the titanium powder. According to the method, operation is easy, the technology is simple, cost is low, the period is short, industrial production is easy, and the application prospects are wide. According to the prepared composite, the structure is easy to control, and stability is good. The dispersing uniformity of a titanium carbide enhanced phase in a titanium base body is good, the micron scale and the nano scale are achieved, interface bonding is good, and obvious defects are avoided.