The utility model discloses a load unbalance compensating system including a current sensor, a voltage sensor, a low-pass filter, a first DSP chip, a touch screen, a second DSP chip, an FPGA chip, a communication interface and an inverter. The current sensor and the voltage sensor are both connected with an input terminal of the low-pass filter. An output terminal of the low-pass filter, the first DSP chip, the FPGA chip and the inverter are sequentially connected together. The touch screen and the second DSP chip are both connected with the first DSP chip. The communication interface is connected with the second DSP chip. The load unbalance compensating system provided by the utility model is suitable for a supply network employing a three-phase four-wire system and taking a single-phase load as the main load, and is high in response speed and high in precision. By adopting the load unbalance compensating system, a stable and quick three-phase balance control effect can be obtained, neutral current in a low-voltage power distribution system is eliminated and comprehensive compensation of reactive power and negative sequence component of the system can be realized.