Abstract: For the problem that existing time synchronization algorithms of WSN are not suitable for time synchronization of data acquisition, the paper proposed a new delay time broadcast synchronization algorithm taking vibration data acquisition of motor of equipment spot inspection system of a coal preparation plant based on WSN as an example. It analyzed principle, realizing process in single-hop WSN and calculations of delay-time compensation and error of the algorithm in details, and compared the algorithm with other time synchronization algorithms of WSN with a conclusion that the algorithm has little overhead, low energy consumption and high synchronization precision. The effectiveness of the algorithm has been verified in data acquisition of equipment spot inspection system of a coal preparation plant based on WSN.