The invention relates to the technical field of black swan breeding, in particular to a cage-free breeding method for black swans. The method comprises the steps of building and disinfecting a pond, controlling the cage-free breeding density, guiding the black swans in building nests, hatching swan eggs at the variable temperature, cutting off feathers in time, injecting disease-resistant medicineliquid and the like. The step of hatching the swan eggs at the variable temperature is the key of increasing the hatching rate of hatching eggs. Compared with existing natural hatching, the yield ofthe black swans is greatly increased. According to the method, through reasonable feed preparation, timely feeding and scientific disease resistance, the yield of the black swans is remarkably increased, meanwhile, the quality of the black swans is also improved, the requirement of the market for the healthy, strong and high-quality black swans is effectively met, the method meets the pollution-free and nuisanceless environmental protection requirement, and accordingly the method has wide application prospects in the technical field of black swan breeding.