Waterproof caisson structure of toilet

The utility model discloses a waterproof caisson structure for a toilet, which comprises a plurality of wall surfaces, and a side closed space is enclosed by the plurality of wall surfaces; a base layer is arranged at the bottom of the side closed space; the first supporting layers are arranged in the side face closed space at intervals in parallel with the base layer, and a caisson is formed between the first supporting layers and the base layer; the first waterproof layers are arranged on the top surfaces of the base layer and the first supporting layer; the second waterproof layer is arranged on the top surface of the first waterproof layer; the second floor drain pipe penetrates through the first supporting layer and the base layer; the first floor drain pipe is arranged on the base layer; the first supporting layer and the base layer are in arc transition connection with the wall face. The water-proof toilet has the advantages of being good in water-proof effect, capable of avoiding water leakage of the