To provide a method for treating chicken droppings for a chicken farm by using a small space and at a low cost for aiming at the reduction, dissolution and disappearance of the chicken droppings.

This treating method is provided by adding natural water containing fermenting type facultative anaerobic soil bacteria to the chicken droppings and a fluidized catalytic material in at least one treating vessel, adding water for adjusting water content as necessary, agitating, decomposing by fermenting while aerating or ventilating, or reducing, dissolving and disappearing dead chicken, feathers contained in the chicken droppings, fine amount of inorganic components contained in the droppings and organic materials of the droppings other than the hardly decomposable materials with the fluidized catalytic material as gas form such as carbon dioxide gas, nitrogen gas, methane gas, hydrogen sulfide and vaporized water content without taking out water or an aqueous solution to the outside of the system.