A strap buckle structure includes a strap body. Two ends of the strap body are provided with an upper buckle piece and a bottom buckle piece. The bottom buckle piece is provided with a raised seat having a threaded hole. The upper buckle piece has a through hole and positioning holes. The strap buckle structure further includes a bolt having a turning disc, a spring, an annular iron seat, and a sealing plate. The annular iron seat is provided with positioning buckles each having a one-way bevel. The positioning buckles are controlled to be inserted into or disengaged from the positioning holes of the upper buckle piece. The turning disc is turned by hand. The bolt is screwed to lock the upper and lower buckle pieces. By using a tool having a magnetic rod to turn the turning disc reversely, the upper and lower buckle pieces can be opened.