The invention discloses an aluminum liquid interface simulating method. The method comprises the steps of collecting an anode guide rod spacing pressure drop data value through a collecting system; the second step of proving that the anode guide rod spacing pressure drop data value has fractal features through correlated functions; the third step of constructing a function iteration system, using a fractal interpolation method to simulate an aluminum liquid interface, compiling a MATLAB program through a function iteration system formula, calculating values of vertical scale factors, inputting interpolate points and the vertical scale factors into a MATLAB program, and simulating an aluminum electrolytic bath aluminum liquid interface. According to the aluminum liquid interface simulating method, the aluminum liquid interface is generated through computer simulation, study personnel can quickly know internal conditions of an aluminum electrolytic bath, adjustment programs are made at a proper time, and thus the financial resources, the material resources and the labor are saved.