The invention provides a bronze drum rust-prevention casting method and belongs to the technical field of casting and corrosion prevention of metal products. The method comprises the following steps that (1) molten copper is poured into a die for casting of a bronze drum, and after being cooled to 200-300 DEG C, the bronze drum is soaked in a phytic acid solution and then is fished up and drained off; (2) the drained bronze drum is put into a high-temperature furnace for annealing and then is put into the phytic acid solution to be soaked; (3) after being subjected to repreated annealing and soaking in the phytic acid solution for 3-6 times, the surface of the bronze drum is polished and washed with ethyl alcohol; (4) the washed bronze drum is soaked in the phytic acid solution and then is drained off; (5) the bronze drum soaked in the step (3) is put into a vacuum drying oven to be dried and then is cooled to the indoor temperature; and (6) the steps (4) and (50 are repeated for 2-4 times, and the surface of the bronze drum is washed with ethyl alcohol. The bronze drum is soaked in the phytic acid solution at a high temperature in the casting process, so that a compact and ordered monomolecular film is formed. The monomolecular film can protect non-corroded copper metal on the bronze drum against corrosion of environmental media.