Abstract: A tension adjustment structure of a boxing training device contains: a base, at least one control module for controlling a tension of a spring, and an impact module. The base includes a first fitting tube and a first screwing element. The impact module includes a coupling stem. The at least one control module includes a first support post, the spring, a second support post, a second fitting tube, and a second screwing element. The coupling stem is inserted through the first support post and the second fitting tube, and the second screwing element is screwed into a locking orifice of the first support post to fix the coupling stem in the first support post and the second fitting tube. The spring is partially fitted on the first and second support posts, and a height of each of the first support post and the second support post is adjustable.

Abstract: A spring tension control device of boxing trainer is disclosed. The boxing trainer includes a base, at least one spring tension control device and a boxing bag, wherein the at least one spring tension control device is connected between the base and the boxing bag, and which is characterized that the at least one spring tension control device includes a rod, a spring, a sleeve, and a bolt; wherein one end of the spring is connected to one end of the rod, the sleeve is movably covered outside the rod or outside the rod and the spring, and one end of the rod adjacent to the sleeve is provide for bolt to be passed through radially, thereby the bolt is against the rod to fasten the sleeve.