The utility model discloses an annular external-spraying dust controlling and settling device for a comprehensive mechanized heading machine. The device comprises an arc-shaped spraying pipe. The two ends of the spraying pipe are respectively connected with a multi-directional spraying block. The spraying pipe is communicated with the multi-directional spraying blocks. A water inlet is formed in the spraying pipe. Horizontal annular spraying nozzles are distributed on the spraying pipe. The inner side of the spraying pipe is provided with an arc-shaped mounting plate. Lateral horizontal spraying nozzles are distributed on the outer side faces of the multi-directional spraying blocks. Vertical perpendicular spraying nozzles are distributed on the bottom surfaces of the spraying blocks. Mounting holes are formed in the arc-shaped mounting plate. The annular external-spraying dust controlling and settling device can effectively control and settle dust produced in the process of coal cutting through the comprehensive mechanized heading machine and dust caused by collapse impact; the device integrates dust controlling, dust suppressing and dust settling; high-concentration dust can be effectively controlled to be within the spatial range in front of a driver of the comprehensive mechanized heading machine, and airflow containing the dust can be prevented from spreading to the driver. In this way, the dust concentration around the driver of the comprehensive mechanized heading machine is greatly lowered, and the total dust controlling and settling efficiency of the device can reach over 9 percent; accordingly, the visual field for a working face is clear, and an operating environment is remarkably improved.