The invention discloses a cluster agent satellite space power generation system and power generation method. The power generation system comprises a plurality of solar sail satellites (auxiliary satellites) and a solar apparatus. The solar apparatus comprises solar panels, transmitting antenna arrays, and bottom main satellites. A reflection system is composed of multiple auxiliary satellites forgathering sunlight on the surfaces of solar panels to maximize the solar energy receiving and to enhance the photoelectric effect. Energy is transmitted to the ground in a microwave wireless manner via the transmitting antenna arrays. The power generation system is a new and efficient clean energy supply system capable of changing the configuration autonomously and intelligently, thereby realizingsustainable energy transmission without being affected by influence from weather and day or night.