The invention relates to a compound, 1-palmitin-2-linolein-3-olein, having a structure of formula (I), which is prepared by a process comprising the preparation of Coix seed oil from the Coix seed powder the preliminary separation of 1-palmitin-2-linolein-3-olein and the double-separation of 1-palmitin-2-linolein-3-olein. The invention also relates to pharmaceutical preparations of 1-palmitin-2-linolein-3-olein, and the use of this compound and pharmaceutical preparations thereof in the treatment of tumors.