Provided is a method for synthesizing a terbutaline intermediate. The method provided in the present invention uses a single menstruum, which can be recycled, to carry out a reaction, and has a simplified process and a simple post-treatment operation. In addition, a key step uses dibromohydantoin as a brominating agent. The method is green, environmentally-friendly and pollution-free, and the obtained product has a high purity and a considerable yield.