The utility model discloses a caisson type bathroom floor assemblyization mounting structure, including prefabricated stand, embedded plate, screw rod and basal plate, embedded plate is pre -buried inprefabricated stand, the last rigid coupling of embedded plate has four screw rods, and four screw rods wind the the central axis circumference interval distribution of prefabricated stand, the top of each screw rod is stretched out by the top face that prefabricates the stand, the equal rigid coupling in top of each screw rod has the basal plate, two liang of mutual butts of the side that the basal plate is adjacent. The utility model discloses a caisson type bathroom floor assemblyization mounting structure, it can assemble four basal plates by four screw rods on the embedded plate in advance in through prefabricated stand to this assembles for the module, forms caisson type structure in the bathroom.