The invention discloses a tri-perfluor decyl silicon-polyethyoxyl-stearate multielement compound as well as a preparation method and application thereof. The multielement compound is prepared from perfluor decane, trifluoroalkyl silane, ethylene oxide and stearic acid through compounding. The preparation method comprises the following steps: mixing the perfluor decane and the trifluoroalkyl silane, acidifying, heating to 150-170 DEG C, adding ethylene oxide, further adding stearic acid after reactions, and finally adjusting the pH value to 7-8, thereby obtaining the multielement compound. Themultielement compound disclosed by the invention is applied to oil fields to carry out foam oil expelling. The multielement compound disclosed by the invention is not only capable of generating foamsefficiently, but also good in foam stabilization effect, has no spectrum separation in stratum migration, particularly has a good foam oil expelling effect on high oil content (the oil content is 80-95%) and high wax foam systems, and meanwhile is simple in preparation method, high in operability and low in cost.