The utility model relates to an automatic commutation device of distribution network has solved not enough that the automatic phase converter response speed of unbalanced three phase is slow among the prior art, the running cost is high. The utility model provides a pair of automatic commutation device of distribution network, single -phase load is passed through phase change switch and is inserted three phase current, the controller passes through wireless repeater control phase change switch, the last information acquisition device who gathers the every looks load information of three phase current that is connected with of three phase current, information acquisition device and controller communication, the information control phase change switch that the controller was gathered according to information acquisition device, make single -phase load insert the minimum looks of load among the three phase current, compared with the prior art, the multi -position switch is simple in structure, the easy access, by information acquisition device, wireless repeater, a controller, the commutation of single -phase load is accomplished in the phase change switch cooperation, single load commutation ten minutes rapidly, the instantaneous power failure of single -phase load can not caused at the commutation in -process, three phase current's quality of supply has been optimized.