The invention provides a three-phase load transfer device, comprising an input module, an input measurement module, a phase sequence adjustment module, a phase sequence display module and an output module, wherein the input module provides the input of the three-phase alternating current, and the input phase sequence of the three-phase alternating current is ABC; by measuring the levels of the current and the voltage of the three-phase alternating current which is input into the input module, the input measurement module judges whether the three-phase load is imbalanced or not; in order to provide three output phase sequences, namely ABC, BCA and CAB, the phase sequence adjustment module adopts three independent contactors for the three-phase current of which the input phase sequence is ABC; when the input measurement module detects the imbalance of the three-phase load by measurement, the operation of switching the output phase sequences is carried out, otherwise, outputting is carried out according to the original phase sequences; the phase sequence display module provides three indicator lights, and each indicator light corresponds to one of the three output phase sequences, namely the ABC, the BCA and the CAB, so as to display the current output phase sequence; and the output module outputs the three-phase alternating current into the load after the phase sequence adjustment module adjusts the phase sequences.