NOVELTY - Preparation of lisinopril intermediate comprises uniformly stirring N-protecting group-L-lysine or N-protecting group-L-lysine-L-proline triacetoxyborohydride, glacial acetic acid and reaction solvent; cooling at 0-10 degrees C; dripping alpha -oxobenzene ethyl butyrate and mixed solution of reaction solvent; continuously reacting at 0-10 degrees C for 0.5-1 hours; further reacting at room temperature for 2-6 hours; adding water; extracting with solvent to obtain lisinopril intermediate; crystallizing; filtering; and drying to obtain product, in which protecting group is trifluoroacetyl or carbonyl.    USE - Preparation of lisinopril intermediate.    ADVANTAGE - The method does not produce toxic by-products, is environment friendly, is carried out under normal pressure, improves yield and safety, provides product with improved S-isomer content, and has reduce production cost.    DETAILED DESCRIPTION - Preparation of lisinopril intermediate comprises uniformly stirring N-protecting group-L-lysine or N-protecting group-L-lysine-L-proline triacetoxyborohydride, glacial acetic acid and reaction solvent; cooling at 0-10 degrees C; dripping alpha -oxobenzene ethyl butyrate and mixed solution of reaction solvent; continuously reacting at 0-10 degrees C for 0.5-1 hours; further reacting at room temperature for 2-6 hours; adding water; extracting with solvent to obtain lisinopril intermediate; crystallizing; filtering; and drying to obtain product; or it may be prepared by uniformly stirring N-protecting group-L-lysine or N-protecting group-L-lysine-L-proline, alpha -oxobenzene ethyl butyrate, glacial acetic acid and reaction solvent; cooling at 0-10 degrees C; adding mixed solution of triacetoxyborohydride reaction solvent; continuously reacting at 0-10 degrees C for 0.5-1 hour; further reacting at room temperature for 2-6 hours; adding water; extracting with solvent to obtain lisinopril intermediate; re-crystallizing; filtering; and drying to obtain product, in which protecting group is trifluoroacetyl or carbonyl.