To provide a treatment device for livestock feces, giving drying treatment to almost all livestock feces discharged from livestock and allowing stable and efficient work for the drying treatment of wet livestock feces.

Collected liquid W containing fine livestock feces stored in a sewage tank 77 for an exhaust gas treatment device 70 and in a storage tank 86 for a deodorizing plant 80 is supplied to a discharge nozzle 90, and water content contained in the collected liquid W discharged from the discharge nozzle 90 is evaporated by the heat of hot air D generated in a combustion chamber 34 of a hot air supply device 30 to give drying or incinerating treatment to the fine livestock feces from which the water content is separated. When the temperature of the hot air D is higher than the preset, the collected liquid W discharged from the discharge nozzle 90 is sprayed to the hot air D to be cooled and the temperature of the hot air D is kept adequate for the drying treatment of the wet livestock feces B in accordance with detected information output from a hot air temperature detecting sensor S.