The invention provides a decision-feedback-based symbol synchronization method. The method comprises: coarse symbol synchronization is realized by means of predetermined coarse synchronization to obtain a coarse synchronization position; and on the basis of the coarse synchronization position, fine symbol synchronization is realized by means of predetermined fine synchronization using decision feedback. Therefore, a problem that a failure is caused in a complicated channel because of channel sensitivity by using autocorrelation of data to carry out symbol synchronization or failures occur at some special channels because of limited capabilities when time domain correlation of a frequency-domain pilot is used for carrying out symbol synchronization in the prior art can be solved. And thus rapid, accurate, and effective symbol synchronization can be realized.