Lifting device for suspended ceiling and construction method thereof

The invention relates to a lifting device for a suspended ceiling and a construction method of the lifting device. The lifting device for the suspended ceiling comprises a folding and unfolding assembly and a lifting assembly, wherein the folding and unfolding assembly corresponds to the arrangement position of a suspended ceiling plate and is detachably mounted below a roof structure; the lifting rope is wound on the retracting and releasing assembly, the retracting and releasing assembly can retract and release the lifting rope, the bottom end of the lifting rope is installed and connected to the ceiling plate, and the lifting rope is retracted through the retracting and releasing assembly so that the ceiling plate can be lifted to the position close to the roof structure; the adjusting piece is detachably installed between the roof structure and the ceiling plate and can be adjusted in a telescopic mode, the ceiling plate is moved to the designed elevation position by adjusting the length of the adjusting