The invention provides a rotary kiln for garbage incineration. The rotary kiln comprises a primary air system and a secondary air system. The primary air system comprises a primary air frequency conversion fan which communicates with a storage pit and is used for introducing odors in the storage pit into the rotary kiln to serve as primary air. The secondary air system comprises a secondary air frequency conversion fan which communicates with the storage pit and is used for introducing the odors in the storage pit into the rotary kiln to serve as secondary air. The odors in the storage pit areintroduced to serve as the primary air and the secondary air, and thus the pressure of a deodorization system can be reduced; and meanwhile, the primary air system and the secondary air system are both provided with the frequency conversion fans, real-time monitoring can be conducted, and according to different materials, the air inlet quantity of the primary air and the secondary air can be automatically adjusted, so that automatic control of an incineration system is achieved.