The invention belongs to the technical field of optics, and particularly relates to a grating external cavity feedback semiconductor laser and an adjusting method thereof. The grating external cavityfeedback semiconductor laser comprises a housing, a substrate, a grating frame, a laser diode, a plane mirror, a pressing plate, a backing ring, a feedback grating, piezoelectric ceramics, a Peltier and a gasket. The plane mirror, the pressing plate, the backing ring, the feedback grating and the piezoelectric ceramics are mounted on the grating frame; the grating frame is fixed in the substrate;and the substrate is fixed on the pedestal of the housing. According to invention, the structure that a laser diode, a feedback grating and a plane mirror in the prior art are arranged separately andindependently is integrated into a whole structure, so that the semiconductor laser has a wider tuning range, the adjustment of the semiconductor laser is simpler and more convenient, and a scheme isprovided for batch production.