A braking assembly with a manageable self-generating power energy is disclosed. A pair of curved braking plates are disposed between the stator and the rotor. A pulling mechanism is provided on the stator for pulling two free ends of two curved braking plates. A plurality of first permanent magnets are fixed to the outer circumferential surface of each the curved braking plates. Moreover, at least one power-generating coil is provided on a stator of the braking assembly nearby the permanent magnets for generating an AC voltage when the rotary central shaft rotates. A control circuit receives the AC voltage and rectifies and stabilizes the AC voltage to generate a DC voltages to drive the motor of the pulling mechanism to rotate, and by means of the pulling mechanism, the braking force of the braking assembly is controlled.