Abstract: The criticism of unjust capitalist economic in theory of Lenins imperialism embodied in three aspects：imperialism expressed bourgeois economics injustice concentratedly；the capitalism characteristics of parasitism and decay in imperialist stage revealed economic injustice; the bourgeois state machine safeguarding monopoly bourgeoisie aggravatedeconomic injustice. Understanding the criticism of unjust capitalist economic in theory of Lenins imperialism gave us some enlightenments: on the one hand, we must recognizeit was inevitable that the proletariat overthrowed capitalism system to build socialist system ownership of the means of production to break a path for economic justice. On theother hand, we should defend our interests to preserve and promote the world economic justice in international economic exchanges.