NOVELTY - Additive for alkaline electrochemical element comprises oxygen containing compounds (I) to (IV).    USE - The additive is useful for alkaline electrochemical element.    ADVANTAGE - The additive: effectively improves the high power charge-discharge performance, low temperature discharge performance and capacity exertion rate of the alkaline electrochemical element; increases the service life of the electrochemical element; and is cheap and obtained easily.    DETAILED DESCRIPTION - Additive for alkaline electrochemical element comprises oxygen containing compounds of formula R-OX (I), R4-C(R3)(OX4)-C(R2)(OX5)-R1 (II), R5-C(OX3)(R6)-C(OX2)(R7)-C(OX1)(R8)-R9 (III) or R10-C(OX1)(R11)-R14-C(OX2)(R13)-R12 (IV).    R, R14 = alkyl having less than 12C;    X, X1, X2, X3 = H, Li, Na or K;    R1-R13 = H or alkyl having less than 12C; and    X4, X5 = Li, Na or K.    INDEPENDENT CLAIMS are also included for    (1) preparation of alkaline electrochemical element comprising: coating the active substance for forming the anode and the cathode; combining the diaphragm into the pole group and locating it in the shell; injecting the alkaline electrolyte solution and respectively connecting the anode and the cathode with the corresponding connecting terminals and sealing the opening; and adding the additive into alkaline electrolyte solution. The step of adding the additive can be carried out by directly adding the additive into the alkaline electrolyte solution, spraying the additive on one or more than one of the formed anode, diaphragm and cathode and dipping, spraying the additive liquid on the surface of one or more than one of the formed anode, diaphragm and cathode, directly adding the additive into the anode active slurry and/or cathode active slurry, dipping the formed pole group in the additive, spraying the additive liquid on the formed pole group and/or directly adding the additive in the shell; and    (2) an alkaline electrochemical element is prepared by using the preparation method.