Abstract: In order to improve the effect of spray dust control on coal dust control, a magnetic activated water dustfall technology is proposed. Taking the bituminous coal of xindingtai coal mine in Jinzhong City, Shanxi Province as an example, the monomer surfactant was optimized and compounded through the contact angle measurement experiment; Magnetization test of the compound surfactant and water; Finally, the constructed roadway similarity model is used to conduct dust reduction experiments and determine the dust reduction efficiency. The experimental results show that the compound effect of anionic surfactant SAS-60 and non-ionic surfactant AEO-7 is the best. The optimum magnetic induction intensity and magnetization time are 4000gs and 50min respectively. The total dusting rate of magnetized compound active agent is as high as 88.3%, which is 57% higher than that of non magnetized water spray, and the dust dusting rate reaches 79.3%, which is 55% higher than that of pure water spray technology. Through the above research, the mechanism that the contact angle and surface tension of magnetized water show the law of multi extreme increase and decrease is revealed, and the magnetized water circulation system is established to make the magnetization effect more stable and lay a foundation for practical application in the workplace.