With the wide application of artificial intelligence technology, negative events occur frequently, such as "big data price discrimination", "artificial intelligence infringement", "algorithm discrimination" and so on. The value neutrality of artificial intelligence, which was deemed by people before, has been questioned a lot. The existing relevant researches in China are mainly discussions at the conceptual level. This article, based on the existing researches, illustrated the value non-neutrality essence of artificial intelligence at the algorithm level of machine learning, from the aspects of the sociality of data, the value preference of algorithm and the reinforcement of decision bias. And then, presented some suggestions on the ethical problems and decision risks caused by the value non-neutrality essence of artificial intelligence.