The invention discloses a distributed feedback injection amplifying semiconductor laser, consisting of a main laser, a first light isolator, a taper laser amplifier, a second light isolator, a tiny light exploring laser power stabilization system and a laser shaping system, wherein, the main laser adopts a distributed feedback semiconductor laser tube, the collimated laser beam is injected into a taper laser amplifying chip passing through the first light isolator, the amplified laser adopts the beam splitting technique passing through the second light isolator, an electrophotonic detector detects the fluctuation of power of the amplified laser, the error signal is sent to a current control interface of the taper laser amplifier through a feedback circuit, the power stability of the laser is outputted after the error signal is amplified by a reverse feedback mechanism, the light outputs the collimated Gaussian beam through the laser shaping system. The distributed feedback injection amplifying semiconductor laser has compact structure, convenient adjustment, wide and narrow laser rays, high power, good stability and strong practicability.