Abstract: A dumbbell with multiple gears of weight adjustment is provided, which includes a dumbbell body, dumbbell pieces provided at two ends of the dumbbell body, and two adjustment mechanisms respectively provided at the two ends of the dumbbell body. The dumbbell body includes a grip rod, a center rod, and two sets of shell components respectively provided on two sides of the grip rod. The center rod is rotatably provided at a center position of the grip rod; each shell component includes a main body shell and a plurality of connection discs. The main body shell is rotatably connected to the grip rod and fixed to the central rod. The connection disks are fixedly provided on the central rod and are distributed along a central length direction. The present application has the effect of improving a weight adjustment efficiency of the dumbbell.