The invention relates to refining processes of polyether ketone ketone crude products, in particular to a method for removal of metal aluminum ions from a polyether ketone ketone crude product with aminotrimethylene phosphonic acid. The method includes: (1) mixing the polyether ketone ketone crude product with a dichloromethane solution of diphenylsulphone, and conducting heating reflux; (2) adding an aminotrimethylene phosphonic acid aqueous solution, further conducting heating reflux, and performing cooling and filtering to obtain a polyether ketone ketone primary product; and (3) putting the polyether ketone ketone primary product and deionized water into a container, conducting ultrasonic treatment, then performing filtering with a centrifuge to remove water, and carrying out drying at130DEG C in vacuum to a constant weight, thus obtaining purified polyether ketone ketone. The polyether ketone ketone adopted by the invention fully swells in the dichloromethane solution of diphenylsulphone, aminotrimethylene phosphonic acid and Al<3+> contained in polyether ketone ketone can form a stable complex, and high frequency ultrasonic treatment is combined to reduce metal aluminum ionsin the polyether ketone ketone crude product to 30ppm or below, and the stability of polyether ketone ketone at high temperature is obviously improved.