A passive power device specifically used for 12-pulse commutating load belongs to the technical field of the electricity quality control device of a power distribution system and is characterized in that the device includes a wave filtering channel; each phase of the wave filtering channel is provided with a single-phase transformer; one end of the winding at one side of the single-phase transformer is connected by adopting a 'Y'-type connection mode; the other end is connected correspondingly with the tail end at the 'Y' side of the 12-pulse commutating load after connected with an L-C filtering branch circuit in series; one end of the winding at the other side of the single-phase transformer is connected by adopting a 'Delta' connection mode; the other end is connected with the tail endat the 'Delta' side of the 12-pulse commutating load after connected with an L-C filtering branch circuit in series. The passive power device specifically used for 12-pulse commutating load has the advantages of novel design and simple structure, avoiding the harmonic currents of 5 and 7 simultaneously while effectively filtering the harmonic currents of 11 and 13 as well as having the advantagesof good wave filtering effect, reliable operation and lower cost.