The utility model discloses a clip-form construction device for a variable cross-section hollow high pier. Sectional dimension-adjustable formworks are installed in the manner of suspension lift slip to become movable variable cross-section steel form structures, and the movable variable cross-section steel form structures upwards climb along supporting rods by utilizing hydraulic jacks; the movable variable cross-section steel form structures are integrated, and parallel operations of steel bar binding, concrete pouring and slip form climbing are performed continuously; supports can be synchronously adjusted during a process of performing construction from pier bottoms to pier tops to finish the physical dimension variable cross-section changes of the pier bodies. The clip-form construction device for the variable cross-section hollow high pier is convenient in construction, fast in progress and good in structural integrity and is safe, reliable and flexible. The clip-form construction device for the variable cross-section hollow high pier is assembled at a time and does not need to be disassembled repeatedly, and therefore, scaffolding and the installation time are saved, and the labor consumption is reduced.