The invention discloses an autogenous tumbling mill for crushing an aluminum oxide crusting block. By the autogenous tumbling mill, media are not required to be ground, so that the purity of a product is improved; a block of which the diameter is less than or equal to 300mm can be changed into particles of which the particle size is less than 0.075mm after being ground at a time, so that a material crushing process is simplified, and working efficiency is improved; and the abrasion resistance of a lining plate is improved, the service life of barrel bodies is effectively prolonged, and the maintenance cost of equipment is reduced. The autogenous tumbling mill consists of a feeding part, a main bearing part, a rotary part, a driven gear, a discharging part, a driving gear, a speed reducer, an active motor, a slow speed driving device, a hollow shaft neck, a feeding end gland, a feeding end hollow shaft neck, a bolt, a lining plate connecting bolt, a discharging end hollow shaft neck, a gear cover, a discharging end gland, an end cover lining plate, a cone end cover, a barrel body flange, a barrel body, a barrel body lining plate and a rubber pad. The autogenous tumbling mill has a simple structure, is convenient to use, is safely operated, is wear resistant and durable and saves occupied space and consumable materials of equipment.