The invention, which belongs to the technical field of power fault location, discloses a fault positioning method for an overhead cable hybrid line. The method comprises: installing fault current detecting devices at a hybrid line bus and all connection points and determining a fault branch of an overhead cable hybrid line according to directions of fault current signals detected by the fault current detecting devices; determining a fault point position based on a calculation formula of the fault point position under the condition of knowing the fault branch; and establishing an overhead-cablehybrid line simulation model and verifying correctness of the fault point position based on the fault types of all detection points in the simulation model. With the method, the fault point can be located quickly and accurately; faults can be eliminated timely; and power supply can be restored. And thus the power supply reliability of the entire system is improved.