A multi-dimensional training device for training arm and wrist and capable of changing weight includes a connection member, a first turning member connected to the connection member, a first handle pivoted on the first turning member, a second turning member pivoted on the connection member, and a second handle pivoted on the second turning member. The second turning member may be disassembled to mount weight member on the connection member or take the weight member off from the connection member. User may hold the first and second handles to turn or move the training device of the present invention for training more muscles and joints.