A laser beam shaping device with a closed-loop self-adaptive mechanism comprises a laser generator, a low-speed feedback unit, a laser amplification unit, an error information feedback unit and a processing unit, wherein the low-speed feedback unit comprises a first semi-reflection and semi-transmission lens and a low-speed wavefront detector, laser emitted from a laser is split into a first reflection beam and a second transmission beam by the first semi-reflection and semi-transmission lens, the first reflection beam enters the low-speed wavefront detector and is sent to a corresponding port of the processing unit through a second data bus after processing, the laser amplification unit mainly comprises a laser amplifier and a modulation mirror, the error information feedback unit mainly comprises a second semi-reflection and semi-transmission lens and a fast-speed wavefront detector, the amplified laser beam is split to second reflection light and second transmission light by the second semi-reflection and semi-transmission lens, and the second reflection light enters the fast-speed wavefront detector and is sent to the processing unit through a first data bus. The laser beam shaping device is a digital laser which can be used for arbitrarily modulating laser intensity.