Vonnegut uses the creative technique of black humor to express the theme in the form of comedy through Billy’s “time travel” and the experience and scenes of war. From the perspective of black humor, this paper analyzes the themes of anti-war and rebirth expressed through black humor in Slaughterhouse Five. Through the poignancy and irony of black humor, it influences people and appeals people to oppose war in all senses. Finally, it shows the theme that the author wants to express through absurd language, confusing time and narrative mode. Through the study, readers can deeply perceive the trauma in the hearts of people who have experienced war, so that they can more deeply understand the thematic ideas of Slaughterhouse Five.