The invention provides a neutral line overlapping switching mechanism, which is characterized by comprising a base, a ratchet wheel I, a ratchet wheel II, a contact rotating shaft I, a contact rotating shaft II, a rotating shaft I and a rotating shaft II, wherein the rotating shaft I and the rotating shaft II are connected with a ABC-phase rotating shaft, the contact rotating shaft I and the rotating shaft II are concentrically arranged, the contact rotating shaft II and the rotating shaft I are concentrically arranged, the ratchet wheel I is fixedly connected with the contact rotating shaft I, the ratchet wheel II is fixedly connected with the contact rotating shaft II, the contact rotating shaft I and the contact rotating shaft II are arranged on the base, a torsional spring II is arranged between the contact rotating shaft I and the base, a torsional spring I is arranged between the contact rotating shaft II and the base, and a ratchet wheel drag hook assembly performing reciprocating motion between the ratchet wheel I and the ratchet wheel II is arranged between the ratchet wheel I and the ratchet wheel II. The neutral line overlapping conversion mechanism is simple in structure, the phenomena of falling off and jamming are avoided, the tension spring can enable the switching between common use and standby use to be high in speed and high in transmission efficiency is high,and the cost is reduced.