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High-pressure spraying is one of the primary methods for dust prevention in coal mine fully mechanized caving face, and the atomization effects of mechanical nozzles influence dedusting result significantly. While so far, the nozzles are selected by technician’s subjective arbitrariness mainly, affecting improving dedusting effect. For this reason, before and after simulating actual air velocity of coal workface, the comparative experiments on the atomization effects of the six kinds of commonly used mechanical nozzles were conducted with self-designed spraying platform. Based on the test data, the average droplets’ size and the atomization quality order of different mechanical nozzles were obtained, moreover, the airflow’s turbulence influence on droplets’ sizes was induced. Finally, according to the experimental results, nozzles used in external spray of shearer were selected for #10310 working face of Xinglongzhuang coal mine in China, which had achieved great dust reduction effects.