The invention relates to an electrochemical composite doping method of graphene. The method comprises steps as follows: Step 1, an electrolyte solution is prepared; Step 2, a copper foil substrate with graphene growing is soaked in the electrolyte solution, and a power supply is connected to be used as a working electrode; Step 3, the power supply is started, a layer of conductive macromolecules are electrically polymerized on the surface of the graphene attached to the copper foil substrate, and a composite structure of conductive macromolecules/graphene/copper foil is formed; Step 4, the conductive macromolecules/graphene/copper foil are taken out, soaked in a cleaning agent for rinsing and dried; Step 5, the conductive macromolecules/graphene are separated from the copper foil and transferred to a target substrate. The method has the beneficial effects as follows: the electrochemical polymerization method which is high in controllability, simple and easy to implement is adopted, a high-conductivity doped layer with uniform thickness is formed on the surface of the graphene in situ, and the uniform and stable doping effect is realized for the graphene; besides, a formed conductive macromolecule membrane can effectively support a graphene membrane and enhance the mechanical strength of the graphene membrane.