The Sea Wolf objectively and truthfully reproduces the living state on the ship named “devil”, from which readers have seen the dangerous, indifferent sea, and the ferocious sea wolf. There is a confrontation between man and nature, and a cruel struggle between man and man. Survival competition and natural selection have become a common phenomenon in human society. Jack London applied Darwinism and social Darwinism to the creation of the novel, and portrayed the sea wolf Larson into the image of its cruelty and animal survival instinct from the point of characterization, emphasizing the influence of the heredity and the environment; he used the concept of survival of the fittest to explain social phenomena and interpersonal relationships. The claim that survival is the first priority brings naturalism to the novel. At the same time, he emphasized the autonomy of the protagonist.