The invention relates to the technical field of air purifiers and especially relates to a negative ion air purifier capable of removing refrigerator peculiar smell. The negative ion air purifier comprises a barrel-shaped casing and a gas conveying pipe, wherein a display screen and a control button are arranged on the outer surface of the front end of the barrel-shaped casing, the control button is arranged on one side of the display screen, a fixed base is fixedly arranged at the lower end of the barrel-shaped casing, a filter core replacing window is arranged on the outer surface of the rearend of the barrel-shaped casing, and a gas outlet is formed in the outer surface of one end of the barrel-shaped casing. The negative ion air purifier capable of removing refrigerator peculiar smelldisclosed by the invention is provided with the barrel-shaped casing, a deodorizing filter core, a negative ion generator and an auxiliary gas inlet outer cover, so that the negative ion air purifieris more suitable for being used in a refrigerator and can eliminate peculiar smell in the refrigerator at the same time; furthermore, the negative ion air purifier can emit negative ions to make the refrigerator have a better preservation effect, the condition that gas cannot enter the refrigerator as the gas inlet is tightly close to an inner wall of the refrigerator is further avoided, the negative ion air purifier is suitable for different work conditions, and a better use prospect is brought.