Weight-adjustable dumbbell

A weight-adjustable dumbbell mainly comprises a dumbbell rod assembly (1), a plurality of dumbbell pieces (7) and a dumbbell tray (9) used for the placement of dumbbell pieces and the dumbbell rod assembly, and is characterized in that connecting holes (8-2) of a handle penetrate through handle mounting through holes (2-7) in bracket control elements (2), and are fixedly inserted into connecting grooves (6-4) of handle connecting columns on dumbbell piece gear shifting control rotary discs (6) through inserting grooves (8-1) in the connecting holes. According to the weight-adjustable dumbbell provided by the utility model, the problems that the weight on the two sides cannot be adjusted synchronously, the inconsistency of the weights at the two ends of the dumbbell is easily caused, and the weight of lifted dumbbell is not balanced when the weight of the weight-adjustable dumbbell in the prior art is adjusted through rotating hand wheel rotary discs at the two ends towards different directions are solved; as long as the handle (8) on the dumbbell rod assembly is rotated, the pair of dumbbell piece gear shifting control rotary discs (6) at the two ends of the handle can be conveniently driven to rotate, and multiple pairs of dumbbell piece locking rotary discs (5) on a core shaft can be driven to rotate, so that . Therefore, weights at the two sides of the handle of the lifted dumbbell are synchronously changed, and the adjustment of the weights at the two sides can be synchronously carried out.