Anti-leakage structure for stainless steel water insulation and drainage box in toilet

The utility model relates to an anti-leakage structure of a stainless steel water insulation and drainage box of a toilet, which is structurally characterized in that a water drainage vertical pipe is fixedly arranged in a toilet caisson, and waterproof layers and waterproof protective layers are arranged on all surfaces in the toilet caisson; the stainless steel water insulation and drainage box is integrally installed in a caisson in a toilet, installation gaps are reserved between the side face and the bottom face and the waterproof layer and the waterproof protection layer, and the reserved gaps are densely filled with ceramsite concrete. The horizontal reserved pipe is positioned in the stainless steel water separation and drainage box and is connected with the drainage vertical pipe through a three-way joint; when the stainless steel water insulation and drainage box is installed, a gradient is set, a secondary drainage floor drain is arranged at the lowest point, and the secondary drainage floor drain