From the perspective of self-consciousness, speculative idealism opposes self-consciousness and real life with the purpose of denying and replacing real life. Facing the real life is the theoretical innovation of The Holy Family to criticize the speculative idealism. As real life was parted from speculative idealism, Feuerbach replaced Hegel’s“the relationship between entity and subject”with“the relationship between human and nature”. He pulled Marx and Engels from the absolute world of ideas back to the real world of life. Feuerbach urged them to pay attention to the living conditions of the general poor in the civil society, criticize the speculative idealism as a religious view, and confirm the theoretical position of real life in the formation of historical materialism.