The invention discloses a dumbbell group facilitating balance weight adjustment. The dumbbell group includes a storage seat and a dumbbell; the dumbbell includes a handle and two balance weight units, wherein each balance weight unit includes a brake cover, a rotation disc, an end disc, a plurality of hook discs, a plurality of balance weight blocks and a rotation limiting member; when the dumbbell is arranged on the storage seat, a brake block on the brake disc is pushed to slide to a releasing position, the handle, the rotation disc, and the hook discs can rotate with respect to the brake disc, and then relative positions between convex portions and gaps of the hook discs and hooking convex portions of the balance weight blocks are adjusted, each balance weight block is selectively arranged in each balance weight space or released from the balance weight space, and balance weight adjustment can be achieved; when the dumbbell is away from the storage seat, the brake block slides to a brake position, and then the handle, the rotation disc and the hook discs cannot rotate with respect to the brake disc, and the balance weight blocks in the balance weight spaces cannot be released from the hook discs; and in this way, the balance weight can be easily adjusted.