Axial flow fan and air conditioner

The invention discloses an axial flow fan and an air conditioner. The axial flow fan comprises a machine shell, fan blades and a flow guide ring. The fan blades are arranged in the machine shell. The flow guide ring is connected with the air outlet end of the machine shell. The flow guide ring comprises a flow guide ring body and an annular inner ring arranged on an airflow channel of the flow guide ring body. The first end of the annular inner ring is connected to the flow guide ring body, and a plurality of sawteeth distributed in the circumferential direction are arranged on the edge of the second end of the annular inner ring. According to the axial flow fan, the annular inner ring is arranged on the airflow channel of the flow guide ring, the multiple sawteeth are arranged on the edge of the annular inner ring, and the multiple sawteeth divide and convert concentrated large-scale vortexes into small-scale vortexes, so that broadband noise in the fan is reduced, the dipole sound source intensity in the fl