The invention relates to a sapphire nut non-fused sapphire optical-fiber output end cap. The sapphire nut non-fused sapphire optical-fiber output end cap comprises a sapphire nut, a sapphire single-crystal capillary and a sapphire single-crystal window film arranged between the sapphire nut and the sapphire single-crystal capillary; an optical fiber is placed in the sapphire single-crystal capillary, the distance from the end face of the optical fiber to the sapphire single-crystal capillary is smaller than 10 [mu]m; the sapphire nut is in thread connection at one end of the sapphire single-crystal capillary; a groove is formed in the connecting end of the sapphire single-crystal capillary, the sapphire nut comprises a nut main body which is a sapphire substrate, and an inner thread hole is formed in one end of the nut main body. The sapphire nut non-fused sapphire optical-fiber output end cap disclosed by the invention breaks through the traditional sapphire end cap fused technology, and uses a screw-thread fit structure, the end face of the optical fiber is in space fit with a sapphire device, and a discrete component is adopted, so that an optical path can be organized more flexibly, and the resistant ability of the device is improved to ensure a laser optical path with higher power to be smoothly operated.