Al-SBA-15 solid acid catalysts with Si/Al ratio ranging from 15 to 50 were prepared and used for the catalysis of esterification of stearic acid with triethanolamine. The Al-SBA-15 (Si/Al=25) catalyst exhibited high activity and selectivity in the esterification, the acid value of the esteramine were reduced to 1.78 mgKOH/g and content of mono-esteramine and di-esteramine reached 84.79%. The activity of Al-SBA-15 (Si/Al=25) was not obviously changed when the catalyst reused 6 times. The results indicated that the catalyst showed good stability during the esterification reaction. The structure and acidity of the catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms (BET), transmission electron microscopy (TEM) and pyridine in situ FTIR. These results showed that Al-SBA-15(Si/Al=25) kept the structure of SBA-15, and had large surface area, uniform channels, and the same time Lewis and Brønst acid sites were presence on the surface of the catalysts.