In　the　low-voltage　(LV)　distribution　network,　a　three-phase　unbalance　problem　often　exists.　It　does　not　only　increase　line　loss　but　also　threaten　the　safety　of　the　distribution　network.　Therefore,　the　author　designs　a　residential　load　transfer　device　for　a　LV　distribution　network　that　can　deal　with　a　three-phase　unbalance　problem　by　changing　the　connecting　phase　of　the　load.　It　consists　of　three　parts:　user　controller　for　phase　swapping,　central　controller　for　signal　processing　and　monitoring　platform　for　strategy　calculation.　This　design　was　based　on　message　queuing　telemetry　transport　(MQTT)　communication　protocol,　and　Long　Range　and　4th　Generation　mobile　telecommunications　(LoRa　+　4G)　communication　mode　is　used　to　realize　the　wireless　connection　between　equipment　and　monitoring　platform,　and　a　control　scheme　is　proposed.　The　improved　multi-population　genetic　algorithm　(IMPGA)　with　multi-objective　is　used　to　find　the　optimal　swapping　strategy,　which　is　implemented　on　the　monitoring　platform.　Then　the　phase　swapping　is　realized　by　remote　control,　and　the　function　of　reducing　three-phase　unbalance　is　realized.　The　practical　experimental　result　shows　that　the　method　can　help　to　reduce　the　three-phase　unbalance　rate　by　changing　the　connection　phase　of　the　load,　and　the　simulation　results　verify　the　effectiveness　of　the　algorithm　in　the　phase-swapping　strategy.