Sunken structure combined formwork and construction technology

The invention relates to the technical field of building construction, in particular to a sunken structure combined formwork and a construction technology, the sunken structure combined formwork comprises a supporting frame, an outer formwork mechanism, an inner formwork mechanism and a driving mechanism, the supporting frame comprises a frame body, supporting legs and rollers, the supporting legs are slidably connected to the frame body in the vertical direction, the rollers are connected to the lower end of the frame body, and the outer formwork mechanism is slidably connected to the frame body in the horizontal direction; the inner mold mechanism is slidably connected to the frame body in the vertical direction, and the driving mechanism is connected to the frame body and used for driving the outer mold mechanism and/or the inner mold mechanism to slide. The driving mechanism drives the inner formwork and the outer formwork to be slidably connected to the frame body, the mounting and dismounting process of