Abstract: A weight-adjustable dumbbell includes a plurality of dumbbell plates; abase for holding the dumbbell plates; a positioning shaft; a handle movably sleeved on the positioning shaft; a plurality of cam structures disposed on two ends of the handle respectively; and a driving plate disposed between the handle and the cam structures, where the handle drives the plurality of cam structures to rotate on the positioning shaft through the driving plate; where two ends of the positioning shaft are respectively provided with a control device, the control device is connected to the cam structure to control the cam structure rotating relatively with the dumbbell plates.

Abstract: Disclosed is a weight plate, including a front fixing member, provided with a first snapping portion and a first channel, where the first channel penetrates the first snapping portion and the first snapping portion is provided with a first snapping recess; a rear fixing member, fixedly connected to the front fixing member and provided with a second channel; a snapping module, movably disposed between the front fixing member and the rear fixing member, where the first snapping portion of an adjacent weight plate is capable of being inserted into the second channel to be snapped with the snapping module; a pressing module, movably connected to the front fixing member through the first channel, to drive the snapping module to open and close; and a first limiting sleeve, sleeved on the pressing module and fixedly connected to the front fixing member, for limiting a maximum stroke of the pressing module.