The utility model discloses an aluminum electrolytic crown crust breaker, comprising a fixed rack (1), a movable rack (5) and an inner guide wheel (6), wherein the movable rack (5) is in sliding fit with a track of the fixed rack (1) through the inner guide wheel (6); an inner guide hub (2) of the inner guide wheel (6) is of an integrated structure and provided with a shaft shoulder (9). According to the aluminum electrolytic crown crust breaker, the structure of the inner guide hub of the crown crust breaker is improved; and by adopting the inner guide hub (2) which is of an integrated structure and provided with a shaft shoulder (9), the strength of the inner guide hub (2) is improved and the service life is prolonged. Meanwhile, an access hole (3) and a service hole (4) are formed in the fixed rack (1) of the crust breaker, so that maintenance and replacement of the inner guide hub (2) are facilitated. The aluminum electrolytic crown crust breaker is reasonable in structure and convenient to maintain and replace, and a potential safety hazard can be effectively prevented, the fault rate of the equipment is reduced, the maintenance cost of the equipment is reduced, and the work intensity of maintenance personnel is reduced.