The utility model relates to a novel third harmonic hybrid power filtering device based on a symmetrical component method. The novel third harmonic hybrid power filtering device is technically characterized by comprising a fifth single-tuned passive filter, a seventh single-tuned passive filter, a single-phase inverter and a signal acquisition phase locking and control circuit, wherein the alternating current power supply, the transformer, the five-time single-tuned passive filter, the seven-time single-tuned passive filter and the load are connected in sequence; an ADC module of the signal acquisition phase-locked and control circuit acquires alternating-current power supply and load side three-phase current and transmits the alternating-current power supply and the load side three-phasecurrent to a DSP module. A phase-locked loop circuit performs phase-locked processing on the three-phase voltage and transmits the three-phase voltage to an FPGA module. The DSP module outputs a PWM signal with a constant frequency to the single-phase inverter through the IGBT drive circuit, and the output current of the single-phase inverter is connected to an AC power supply and a load. The active power filter is reasonable in design, good in filtering effect and low in cost, improves the third harmonic filtering efficiency of the active power filter, and can be widely applied to the technical field of power filtering.