The invention discloses a crust breaking hammer head of aluminum electrolytic cell and a preparation method thereof. The crust breaking hammer head comprises a hammer head portion and an installationportion. The installation portion comprises a threaded connection section, a transition taper section and a hammer head connecting section which are formed in one. One end of the hammer head portion is movably connected with the hammer head connecting section, the other end of the hammer head portion is hemispheric. The hammer head portion comprises a hammer head base body and a carburized layer,a boronizing layer and an erosion resistant layer which are arranged on the outer surface of the hammer head base body. The preparation method of the crust breaking hammer head of aluminum electrolytic cell includes the following steps that (1) a hammer head is produced; (2) an installation portion is produced; (3) the hammer head of the external thread is screwed into a taper hole of the internalthread of the hammer head connecting section, and a finished product can be obtained after screwing tightly, wherein a production process of the hammer head portion comprises surface preheating treatment, carburization treatment, tempering treatment, boronisation treatment, quenching treatment, erosion resistant coating covering and finishing turning of the hammer head base body. The crust breaking hammer head of the aluminum electrolytic cell has reasonable design and practical process method, effectively improves the wear resistance, high temperature resistance and corrosion resistance of the hammer head, prolongs the service life, and has low cost and good benefit.