The invention provides a chemical combination tower cavity used for metal atomization powder process. The chemical combination tower cavity used for the metal atomization powder process comprises a chemical combination tower shell body and a chemical combination reaction cavity mounted in the chemical combination tower shell body; the chemical combination reaction cavity is made of a carbon-carboncomposite material of which outer surface is coated with a high temperature anti-oxidation coating; a connecting cavity connected with an atomization spraying disk is arranged at the top end of the chemical combination reaction cavity and a leaking pipe is arranged at the bottom of the chemical combination reaction cavity; an air inlet pipe is arranged near one side of the leaking pipe; an air exhausting nozzle is arranged at the junction of the connecting cavity and the chemical combination reaction cavity; a strengthening assembly is arranged at the side wall of the chemical combination reaction cavity. The chemical combination tower cavity used for the metal atomization powder process is simple in structure and low in manufacture cost; the chemical combination reaction cavity is made of various materials in a composite manner, so that the high-temperature-resistant performance is good; the gas tightness is good.