Optical fiber laser with adjustable light spot energy

The invention relates to the technical field of laser, in particular to an optical fiber laser with adjustable light spot energy. The laser comprises a laser body, the laser body is connected with an external power supply through a control power supply, a laser generator and a lens group are arranged in the laser body, an iron core is mounted in a mounting shell, a primary magnetic core is fixedly arranged on one side of the iron core, and a primary coil connected with the external power supply is wound on the primary magnetic core. A magnetic rotating body is rotationally arranged on the other side of the iron core, a non-magnetic rotating body is further rotationally arranged in the mounting shell, the secondary coil is sequentially wound on the magnetic rotating body and the non-magnetic rotating body, and the two ends of the secondary coil are connected with the two power input ends of the laser generator; and the magnetic rotating body and the non-magnetic rotating body are in transmission connection. Ac