This invention discloses a method for deodorizing wastewater by using seed deodorizer. The seed deodorizer includes caraway seed, celery seed, etc. The seed deodorizer can be used for treating wastewater from pharmaceutical plants, chemical plants, food plants and dyeing plants, and has an ideal deodorizing effect. The method has such advantages as easy operation, good treatment effect, easy post treatment, no secondary pollution and no need for high investment. Besides, the method is environmentally friendly.