Weight-adjustable dumbbell

A weight-adjustable dumbbell, comprising:

• a handle;
• and
• counterweight block groups, wherein the counterweight block groups comprise main counterweight blocks and auxiliary counterweight blocks;
• the main counterweight blocks are connected to two ends of the handle;
• one side of each auxiliary counterweight block is provided with a first connecting part;
• the main counterweight blocks are provided with first connecting fitting parts;
• and the first connecting parts are detachably connected to the first connecting fitting parts;
• wherein each of the main counterweight blocks and the auxiliary counterweight blocks comprises a counterweight block shell, a fixed cover plate, and a counterweight iron plate;
• the counterweight block shell and the fixed cover plate are fitted together to form a counterweight block cavity, the counterweight iron plate is enclosed in the counterweight block cavity;
• wherein each first connecting part is a first buckle part;
• each first connecting fitting part is a first buckle fitting part;
• and the first buckle part is detachably connected to the first buckle fitting part;
• wherein the first buckle part is a first spinning buckle;
• the first buckle fitting part is a first spinning slot;
• the first spinning buckle is provided with a first stop convex block;
• the first spinning slot is provided with a first stop edge;
• the first stop edge is provided with a first notch;
• the first notch is communicated to the first spinning slot;
• when the first stop convex block rotates with the first spinning buckle to the first notch, the first stop convex block is able to be inserted into the first spinning slot via the first notch along with the first spinning buckle;
• and when the first stop convex block is inserted into the first spinning slot via the first notch along with the first spinning buckle, the first spinning buckle is rotated to enable the first stop convex block to rotate to be staggered from the first notch, causing the first stop edge to stop the first stop convex block of the first spinning buckle in the first spinning slot, so that the main counterweight block and the auxiliary counterweight block are combined to form a whole.