The invention relates to the technical field of fiber lasers, and particularly to a high-energy ultrashort-pulse fiber laser. The high-energy ultrashort-pulse fiber laser comprises a first fixing plate, and three U-shaped connecting blocks which are arranged in an annular array are arranged on the outer wall of the circumference of the first fixing plate; each U-shaped connecting block is hinged with a supporting device; and a fastening device is arranged on the surface of the first fixing plate and comprises a first U-shaped fixing block, a second U-shaped fixing block is movably connected to...
