The invention discloses a preparation method for enhancing carbon fiber composite based on graphene. According to the preparation method, a three-dimensional graphene skeleton is used for preparing acomposite slurry precursor through avacuum pouring method, a high-speed stirring ultrasonic assisted method is adopted to prepare high-dispersed graphene resin-based composite slurry, and finally a graphene/ fiber enhanced resin-based composite is prepared through a gradient curing winding method. According to the preparation method, the problem that the prior art cannot combine the graphene withcarbon fiber is solved, the mechanical properties of the fiber composite is improved, the competitive advantage of the composite in the application field is increased, and a novel preparation method is provided for enhancing the carbon fiber composite based on the graphene.