The invention belongs to the technical field of water treatment, and particularly relates to a precise dephosphorization nanomaterial and a preparation method thereof and conventional power integrated sewage treatment equipment. The material is prepared from 20-50 parts of montmorillonite, 30-60 parts of bentonite and 10-30 parts of activated clay through dry mixing, pugging, firing and the like. The conventional power integrated sewage treatment equipment comprises an anoxic zone, an aerobic zone, a membrane pool zone, an equipment zone and a precise dephosphorization zone which sequentially communicate with one another; a carrier is arranged in the middle of the anoxic zone, a multifunctional nanocomposite material is carried in the carrier, a carrying box is arranged in the precise dephosphorization zone, and multiple layers of precise dephosphorization nanoparticles are arranged in the carrying box. According to the conventional power integrated sewage treatment system, the removal efficiencies of pollution factors such as COD, ammonia nitrogen, total nitrogen, total phosphorus, heavy metals and SS of incoming water can be obviously improved and are higher than or equal to 95%, 97%, 97%, 97%, 98% and 99% respectively, and the effluent indexes are superior to the national first grade A standard.