The invention discloses a measurement method of aluminum liquid interface fluctuation. The method comprises the following steps: step one, collecting anode current of each anode in an aluminum electrolysis cell and calculating an anode current fluctuation coefficient of each anode; step two, obtaining a theoretical aluminum liquid interface height and a position coordinate corresponding to each anode by using a CFD current field simulation technology, and correcting the theoretical aluminum liquid interface height by using the anode current fluctuation coefficient to obtain an aluminum liquidinterface actual height of each anode; step three, obtaining an aluminum liquid interface actual height and a coordinate position of each sample point in the whole electrolysis cell by using a Krigingspatial interposition method according to the aluminum liquid interface actual height and the position coordinate of each anode; and step four, building a three-dimensional coordinate system throughthe position coordinate and the aluminum liquid interface actual height of each sample point in the electrolysis cell and drawing a three-dimensional diagram and a two-dimensional contour diagram of the aluminum liquid interface. The three-dimensional diagram and the two-dimensional contour diagram obtained by the method are capable of visually reflecting the aluminum liquid interface fluctuationcondition.