The invention discloses a device for conducting passivation on powder produced through a carbonyl method. The device comprises a buffer tank, a powder material bin, a gas outlet pipe, a pollution discharge pipe, an air or oxygen gas inlet pipe, a first nitrogen gas inlet pipe and a second nitrogen gas inlet pipe. One end of the gas outlet pipe is connected with the top of the buffer tank, and the other end of the gas outlet pipe is connected with the powder material bin. The pollution discharge pipe is connected with the bottom of the buffer tank. The air or oxygen gas inlet pipe and the first nitrogen gas inlet pipe are connected with the side wall of the buffer tank. The second nitrogen gas inlet pipe is connected with the powder material bin. The gas outlet pipe, the pollution discharge pipe, the air or oxygen gas inlet pipe, the first nitrogen gas inlet pipe and the second nitrogen gas inlet pipe are each provided with a valve. A sampling opening is formed in the portion, between the valve on the gas outlet pipe and the buffer tank, of the gas outlet pipe. By means of the device for conducting passivation on the powder, concentration stability of passivated gas is guaranteed; the reasonable passivation mode is arranged, so that mixing of CO and oxygen gas is effectively reduced and controlled; and safety and reliability of operation are guaranteed.