Disassembly-free bottom die for floor slab

The utility model discloses a disassembly-free bottom die for a floor slab. The disassembly-free bottom die comprises a bottom die body, C-shaped section steel and an auxiliary plate. In the using process, the bottom die adopts a cement fiberboard or a glass magnesium board as a pressure-bearing template, the C-shaped section steel is installed on the bottom die, the C-shaped section steel is connected with the bottom die through a self-tapping screw, the distance between the C-shaped section steel and the bottom die is 200 mm, the bottom die is arranged on a floor support in the using process, reinforcing steel bars are arranged above the bottom die, and concrete is poured on the bottom die. The bottom die and the concrete bottom plate are combined into a whole, meanwhile, the C-shaped section steel is poured into the concrete to play a role in reinforcing and tying the bottom die, meanwhile, spot welding of a steel bar truss can be conducted on the disassembly-free bottom die, and a steel bar truss plate is