The invention discloses a national standard timing tracking method of digital television terrestrial broadcasting, which comprises the following steps of: selecting PN sequence data; implementing channel estimation to the selected PN sequence data x '(i) and obtaining a result sequence of the channel estimation; implementing path identification to the channel estimation result and determining a path set A by the path identification; finding a first path or the strongest path from the identified path set A, comparing the found first path or the strongest path i with a preset first path or the strongest path I, moving a synchronous position right if i is less than I, and moving the synchronous position left if i is more than I. The invention has the advantages of low algorithmic complexity,high reliability and small need of resource.