The invention discloses a rotary garbage incineration device. The rotary garbage incineration device comprises a hanging rod, a motor, rotary shafts, a transverse rod, air cylinders, a rotary furnacebody, a feeding opening, stirring rods, a fire grate, an ash storage chamber, a slag discharging machine and a slag transport car. The motor is arranged in the center of the bottom end of the hangingrod. The rotary shafts are arranged in the center of the bottom end of the motor. The bottom ends of the rotary shafts are arranged in the center of the upper end of the transverse rod. The two sidesof the bottom end of the transverse rod are each provided with the corresponding air cylinder. The bottom ends of the air cylinders are arranged on the two sides of the upper end of the rotary furnacebody. The feeding opening is formed in the center of the upper end of the rotary furnace body. An upper cover is arranged on the feeding opening. The stirring rods are arranged in the rotary furnacebody. The fire grate is arranged at the bottom end of the rotary furnace body. Supporting lugs are arranged around the fire grate. A ring sleeve is arranged on the upper side of the fire grate and arranged at the bottom end of the rotary furnace body in a sleeving manner. The ash storage chamber is arranged at the bottom end of the fire grate. The slag discharging machine is arranged at the bottomend of the ash storage chamber. The device is simple in structure and reasonable in design, garbage can be thoroughly incinerated conveniently, and furnace ash can be cleared away conveniently.