The invention discloses a laser device chip and a manufacturing method thereof. The laser device chip comprises a laser device area; the laser device area comprises a grating layer and an active layer; the light emitting face of the active layer and the light emitting face of the grating layer are spaced by a first distance; the backlight face of the active layer and the backlight face of the grating layer are spaced by a second distance; and the preset distance difference exists between the first distance and the second distance. By reasonably setting the length and the position of the grating layer of the laser device area and optimizing the structure of the laser device chip, the magnitude of reflecting light of the output end and the magnitude of phase shift are decreased, thus power mutation of a laser device is restrained, and the error rate of signal transmission is lowered.