The present invention discloses a dual-power overlapped closing operation mechanism, relating to the field of dual-power switches. The dual-power overlapped closing operation mechanism comprises a first contact, a second contact, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod, a seventh connecting rod, a first auxiliary shaft, a second auxiliary shaft and a third auxiliary shaft. The fourth connecting rod rotates anticlockwise to push, via the fifth connecting rod and the seventh connecting rod, the second contact to make electrical contact with the second fixed contact, and at the same time the first contact is first tightly pressed via the second connecting rod and the third connecting rod until the dead point is passed, and then the first contact is gradually opened clockwise. The result of the fourth connecting rod rotating clockwise is similar, in which the second contact is first tightly pressed until the dead point is passed, and then the second contact is gradually opened clockwise. With the present invention, the neutral line overlapping has an extended duration and is maintained by means of a mechanical structure so as to effectively avoid the occurrence of a zero line break.