Overhead floor structure and construction process thereof and catering lobby floor

The invention relates to the field of buildings, and specifically discloses an overhead floor structure and a construction process thereof and a catering lobby floor. The overhead floor structure includes a load-bearing layer, a waterproof protective layer laid above the load-bearing layer, a floor layer laid above the waterproof protective layer and a supporting device mounted on a basic floor; the top of the supporting device abuts against the bottom of the load-bearing layer, the supporting device is capable of adjusting the spacing between the load-bearing layer and the basic floor, and the catering lobby floor includes the above-mentioned overhead floor structure. The overhead floor structure adopts the supporting device for overhead arrangement of the load-bearing layer and the waterproof protective layer and the floor layer above the load-bearing layer, the space between the load-bearing layer and the basic floor is not filled with ceramsite, the load bearing of the floor is reduced, and the operating