The invention discloses an identification method of low-voltage distribution box user phase big data based on load mutation synchronization. Firstly, three-phase current values are periodically sampled and stored by an electrical information collector; in the operation process of the electrical information collector, if an "current mutation synchronization checking" communication message uploadedby a single-phase watt-hour meter is received, the three-phase current change values are calculated respectively; and the current change values of phase A, phase B and phase C are analyzed, and phaseinformation of the single phase watt-hour meter is obtained. According to the identification method of the low-voltage distribution box user phase big data based on load mutation synchronization, phase information recognition of a single phase meter in a low voltage distribution station area can be realized.