The invention discloses a three-phase unbalanced compensation point positioning method for a low-voltage power distribution network .Compensation devices are simulated from a tail pole to a head pole of a circuit one by one, and the initial installation positions of the compensation devices are determined; three-phase unbalanced load compensation is conducted on each pole on branch circuits, and user number algebras and three-phase unbalanced drop factor variations carried on an A-phase circuit, a B-phase circuit and a C-phase circuit of each pole are calculated; according to the three-phase unbalanced drop factor variations, the final installation positions of the compensation devices of the branch circuits are determined; after the compensation positions of all the branch circuits are determined, the positions are gathered to the head pole, the unbalanced load distribution condition of each branch circuit is shown through data converted to the head pole, and the load distribution condition on a main circuit is determined; calculated main circuit load distribution is regarded as branch circuit load distribution, the main circuit is processed through the unbalanced load processing method of the branch circuits, and the compensation position of the main circuit is finally determined.