The invention relates to an active distribution network FTU optimization configuration method. The method comprises the following steps: establishing an optimization model including an integrated objective function with the best investment cost and state estimation accuracy, a reliability index constraint, a node voltage and branch power qualification ratio constraint, and a load rejection constraint; the part of an active distribution network feeder terminal being reduced from 'three remotes' to 'two remotes'; part of the active distribution network feeder terminals being reduced to unmatchedterminals; outputting the optimal results of 'three-remote' and 'two-remote' phases of active distribution network FTU optimal configuration. The active distribution network FTU optimal configurationmethod of the invention mainly considers the FTU configuration of line switches, and can comprehensively consider factors such as state estimation accuracy, investment cost, reliability and the likewhen the distribution terminal of the active distribution network is optimized in configuration.