The invention discloses a deodorization device for a urinal, which is characterized by comprising a plasma generator, a quartz tube and a metal upper cover, wherein the quartz tube is a sealing tube body filled with water, is positioned below the metal upper cover and is connected with the bottom of the metal upper cover, the positive pole of the plasma generator is connected with the water in the quartz tube through a metal wire, and the negative pole of the plasma generator is connected with the metal upper cover through the metal wire. The deodorization device not only has a strong deodorization effect, is not harmful to the human body, and has a lower use cost.