Concrete floor slab thickness control device and construction method thereof

The invention provides a concrete floor slab thickness control device and a construction method thereof, and belongs to the technical field of building construction. The concrete floor slab thickness control device is mainly composed of the following structures that a phi 10mm reinforcing steel bar (2) is welded on a 100*50*3mm steel plate base (1), wherein the length of the reinforcing steel bar (2) is 6mm smaller than the thickness of a floor slab; a 50*50*3mm horizontal control steel plate (3) is welded at the other end of the reinforcing steel bar; and phi 3 iron nails (4) are arranged. The construction method comprises the step that after cast-in-situ floor slab reinforcing steel bars are bound, the phi 3 iron nails (4) are used for nailing and fixing the concrete floor slab thickness control device which is formed by welding the 100*50*3mm steel plate base (1), the phi 10mm reinforcing steel bar (2) and the 50*50*3mm horizontal control steel plate (3) with a formwork. When floor slab concrete is poured