Multistage optical fiber amplifier system

The invention relates to the technical field of lasers, in particular to a multistage optical fiber amplifier system which comprises a box body, a bottom plate, an optical fiber device, a cover plate, a dismounting device, a covering device and an adjusting device, the adjusting device comprises an adjusting block, a fixed bottom rod, an adjusting sliding rod, a limiting rod, a connecting base, an adjusting top plate and a rotating assembly, and the adjusting block is slidably connected with the box body. The fixing bottom rod is fixedly connected with the box body, the adjusting sliding rod is fixedly connected with the adjusting block and is in sliding connection with the fixing bottom rod, the limiting rod is in sliding connection with the fixing bottom rod and is in abutting connection with the adjusting sliding rod, and the connecting base is fixedly connected with the adjusting block. And the adjusting block slides vertically, so that the connecting base and the adjusting top plate move vertically toget