A seat latch structure is provided, which includes a base bracket mounted on a seat for a vehicle and having a first insertion hole and a second insertion hole formed thereon and an opening which is formed on one side thereof and into which a striker fixed to a vehicle body is inserted, a claw having a first through-hole formed thereon to correspond to the first insertion hole and a locking groove formed on one side thereof, a pawl provided on one side of the claw and having a second through-hole formed thereon to correspond to the second insertion hole, a first rotating shaft and a second rotating shaft inserted into the first through-hole of the claw and the second through-hole of the pawl, respectively, and a double torsion spring connecting the first through-hole and the second through-hole into which the first rotating shaft and the second rotating shaft are inserted, respectively. According to the seat latch structure, the noise generated during the operation of the seat latch is reduced and the operating force is increased to improve the merchantability.