A semiconductor laser module including a barrel screwed up with a screw cap and a semiconductor laser beam generating device mounted inside the barrel and triggered to emit a laser beam out of a laser beam firing hole on the screw cap, wherein the semiconductor laser beam generating device has two opposite pairs of planes spaced equiangularly spaced around the periphery and respectively stopped against; the barrel has springs mounted in respective locating holes and respectively stopped against two adjacent planes on the semiconductor laser beam generating device and two adjustment screws mounted in respective screw holes and respectively stopped against the other two adjacent planes of the semiconductor laser beam generating device and turned to align the longitudinal central axis of the position of the semiconductor laser beam generating device with that of the barrel.