Weight-adjustable dumbbell

A weight-adjustable dumbbell is mainly composed of a dumbbell rod assembly (1), multiple dumbbell pieces (7) and a dumbbell tray (9) used for containing the dumbbell pieces and the dumbbell rod assembly. The weight-adjustable dumbbell is characterized in that connectors (8-2) of a handle penetrate through handle installation through holes (2-7) in support control elements (2) to be fixedly connected to connecting grooves (6-4) in handle connecting columns on dumbbell piece gear-shifting control rotating discs (6) in an inserted mode through insertion grooves (8-1) in the connectors. The weight-adjustable dumbbell solves the problems that in the prior technical patent, because the weight of a weight-adjustable dumbbell is adjusted by rotating hand wheel rotating discs at the two ends in different directions, synchronous weight adjustment of the two sides can not be achieved, weight inconformity of the two ends of the dumbbell is likely to occur, and weight imbalance of the lifted dumbbell is caused. According to the weight-adjustable dumbbell, the pair of dumbbell piece gear-shifting control rotating discs (6) at the two ends of the handle can be conveniently driven to rotate just by rotating the handle (8) on the dumbbell rod assembly, and meanwhile multiple pairs of dumbbell locking and unlocking rotating discs (5) on a central spindle are driven to rotate, so that simultaneous and synchronous weight changing of the two sides of the lifted dumbbell is achieved, and synchronous weight adjustment of the two sides is achieved.