The invention discloses a beam near-field intensity distribution self-homogenizing high-energy laser device. The device includes a beam rotation system, wherein the beam rotation system includes at least five reflectors of an odd number, the five reflectors are set as a first reflector, a second reflector, a third reflector, a fourth reflector and a fifth reflector, all the reflectors are in the same optical principal plane, and a center connection line of the first reflector and the fifth reflector constitutes a rotation axis of the beam rotation system. The device is advantaged in that the beam rotation system enables same-optical axis transmission of an incident beam and an outgoing beam, uniform distribution of the light field in a cavity is achieved through utilizing the gain self-compensation effect during beam rotation, the beam quality of the laser device is effectively improved, moreover, combined with a shaping beam expanding system and the beam rotation system, the laser mode volume is fully expanded, and the utilization rate of gain zone activated particles is improved.