The present invention relates to the technical field of health food, and discloses a memory improving composition and the preparation method and use thereof. The composition is made from Arillus Longan, Poria, Semen Nelumbinis, enzymatic extract of Semen Juglandis , phosphatidylserine and taurine. In the present invention, the sovereign drug Arillus Longan is combined with ministerial drugs Poria and Semen Nelumbinis to synergistically achieve the effect of nourishing heart for tranquillization and tonifying kidney & invigorating spleen. They are further combined with enzymatic extract of Semen Juglandis improving brain metabolism and enhances memory, functional factor phosphatidylserine increasing fluidity and enhances plasticity of cell membrane, and taurine improving memory, to achieve the purpose of memory improvement together. All kinds of raw materials are medicine homologous and new resource food, which are safe, have no toxic and side effects, and thus can be consumed as health food over a long period of time.