Abstract: Thermal power generation is a high water-consuming industry and there is a large waste of water resources. As a technology for particle aggregation and removal, the acoustic wave agglomeration technology can be used in the field of flue gas or cooling tower water recovery in power stations. On the basis of the technology of promoting droplet agglomeration under the action of acoustic field, relevant experimental research is carried out to explore the effects of frequency, initial concentration of droplets and sound pressure level on the effect of droplet agglomeration. The results show that under the same conditions of sound pressure level, the sound waves of 500 Hz and 1 000 Hz can achieve better effect of agglomeration than other conditions. It is analyzed that the above two frequencies will generate standing waves, which will increase the efficiency of acoustic wave agglomeration. The standing wave generated by the sound wave at 1 000 Hz is more affected by the sound attenuation, and the effect of droplet particle size increase is poorer, so the effect of agglomeration at 500 Hz is better than that at 1 000 Hz. The increase in the initial concentration of droplets indicates that the more the number of droplets per unit volume, and the perturbation of the sound wave can obviously increase the probability of collision of droplet particles and promote the agglomeration. With the increasing of the sound pressure level from 120 to 150 dB, the particle size of droplet acoustic wave agglomeration is better than that at 500 Hz. And at the same time, the increase in the initial concentration of droplets indicates that the number of droplets per unit volume is greater. With the sound pressure level increases from 120 to 150 dB, the particle size of droplet acoustic agglomeration increases, and the effect of agglomeration is obviously enhanced. The results of the study to a certain extent for the acoustic agglomeration technology in the field of power station tail flue and cooling tower moisture recovery is of great significance.