The invention discloses a start-up method of a receiving terminal power grid for enabling the DC feed-in. The method comprises the steps of screening out priority on-off lines according to a grid structure and a power flow result of a receiving terminal power grid; turning on and off the priority on-off lines one by one and calculating the vulnerability indexes of each priority on-off line; according to the vulnerability indexes, constructing an on-off line fault set; calculating the temporary drop index of a bus voltage during each on-off line fault in the on-off line fault set; according tothe temporary drop index of the bus voltage, constructing a voltage weak bus node set; representing the electrical distance between each unit and each bus node in the voltage weak bus node set throughthe mutual impedance of the node; ranking the voltage supporting capacities of all units according to the electrical distance; and checking the ranking result of the voltage supporting capacities.