In the black humor, the antinomy of comedic contradictions has been used to its maximum, and developed to an antinomy of self-nomination and self-entanglement. The gene mutation from humor to black humor is due to the fact that the inner antinomic contradictions have developed into an irrational ultimate antinomy, so that "the harmless ugly" of the object turns into "the harmful evil". The black humor author observes closely and represents the absurdity of matters to highlight the universal and metaphorical significance of his characters and their existence. Such representation obstructs the rationality of the receptive subject so that he experiences an aesthetic shock mixed with both terror and fun. So the antinomy as a hidden structure of black humor reveals the limitation of human rationality, conveys a very complicated aesthetic experience, and at the same time, indicates the transcendence of human aesthetic spirit and the deepening of comedic consciousness.