The invention discloses a toilet backfilling construction process. The toilet backfilling construction process comprises the following steps that step 1, the height and position of a toilet squattingpan are determined according to the overall elevation of a room, the squatting pan is suspended and fixed, and a drain outlet of the squatting pan is in butt joint with a sewer; step 2, a waterproof layer is laid in a caisson; (3) a foam concrete layer is backfilled into the caisson, wherein the upper surface of the backfilled concrete layer is 1-3 cm away from the bottom of an water inlet of thesquatting pan; step 4, the height of a concealed floor drain is determined, and concealed floor drain protection is carried out; and step 5, ceramic tiles are paved by adopting a thick sticking method, and a waterproof slope is arranged on the ceramic tiles. According to the toilet backfilling construction process, the squatting pan can be directly fixed to the foam concrete layer, a telescopic rod used for fixing the squatting pan is convenient to disassemble and can be repeatedly used for many times, waste is not left, foam, air bags and other disposable materials are not required to reservethe position of the squatting pan, and environmental protection and conservation can be achieved.