The utility model discloses a low-voltage large-user all information acquisition device of a public transformer. The device comprises a shell and a hardware main body arranged in the shell. The shell is provided with a display screen. The hardware main body comprises a control module, a display module, a communication module, an all information acquisition module and a memory. Data collected by the all information acquisition module comprises a voltage of a low voltage power end, a current, power, a power factor, a zero sequence current, a zero sequence voltage, an active electric quantity, a reactive electric quantity and a voltage imbalance rate. The device of the utility model can realize on-line monitoring on a low-voltage user terminal line so that fault analysis is convenient; power supply reliability and economy are increased. According to different places, an appropriate communication mode is selected to realize a bidirectional interaction between a distant-place center control terminal and a user terminal so as to satisfy communication requirements of various kinds of usage places.