The invention discloses a determination method for the filling amount of engine oil of an automobile engine. The determination method comprises a determination method for the minimum amount V1 of the engine oil needed by an engine oil pan in the engine operation process and a determination method for the maximum amount V2 of the circulating engine oil in the engine operation process. The determination method for the minimum amount V1 of the engine oil needed by the engine oil pan in the engine operation process comprises the steps of 1, determining the horizontal acceleration of a whole automobile on various extreme conditions; 2, selecting the horizontal acceleration a of the engine oil in the engine oil pan in the engine operation process; 3, calculating the dip angle alpha of the liquid level of the engine oil in the engine oil pan; 4, calculating the minimum amount of the engine oil in each direction; 5, determining the minimum amount V1 of the engine oil needed by the engine oil pan in the engine operation process. According to the determination method, the amount of the engine oil needed by the engine can be accurately determined at the initial stage of development, and the cost of development can be lowered.