The invention belongs to the field of high tension tests, and relates to a high-resistance phasing apparatus for a low tension side of a transformer and a measuring method thereof. The high-resistancephasing apparatus comprises a high-resistance phasing rod and a microammeter. The high-resistance phasing rod comprises a first phasing rod and a second phasing rod. A first binding post at the headend of the first phasing rod and a first binding post at the head end of the second phasing rod are each provided with a phasing contact. The tail of the first phasing rod and the tail of the second phasing rod are each provided with a second binding post. The second binding post of the first phasing rod is connected with the microammeter. The microammeter is connected with the second binding postof the second phasing rod. The high-resistance phasing apparatus is reasonable in structural design, is capable of accurately judging whether a juxtaposed system and a low tension side or a bus of aninstantly input transformer are consistent in phase, and greatly reduces purchase costs and maintenance costs of apparatuses.