HQ series of high-power single-mode continuous fiber lasers, by solving the bottleneck problems that limit the average power of high-power single-mode fiber lasers to further increase mode instability (TMI), stimulated Raman scattering (SRS), poor beam quality, etc., the average output power of single resonator and single transverse mode laser is increased to 12000W. The series of products with high average power, multiple anti-high reaction, high beam quality, high electro-optical conversion efficiency in one can be widely used in fine cutting, metal welding, surface treatment, 3D printing and rapid prototyping and other occasions. Especially in the metal plate cutting, not only the cutting speed is fast, but also the plate cutting seam is fine, the section is bright, compared with other similar types of lasers on the market is very obvious.