Multi-rotor wind power generation system with equal beam length

The invention discloses a multi-rotor wind power generation system with equal beam length, which comprises a lower pylon 1, a rotary bearing 3, windmills, an upper pylon 2, a rope and/or a rod 8, beams 6 and a tail vane 7, wherein the rotary bearing is arranged between the upper pylon and the lower pylon; two sides of the upper pylon are respectively connected with one ends of the beams; the outer end of the uppermost beam is connected with the top end of the upper pylon through the rope and/or the rod; the outer ends of adjacent beams are connected through the rope and/or the rod; the lengths of the beams at two sides of the upper pylon are equal; the windmills are fixedly connected with the top of the upper pylon or/and the beams; the number of the windmills on the beams at one side is greater than that of the windmills on the beams at the other side; and the tail vane is connected with the upper pylon, the beams or/and an engine room through a pin roll. The multi-rotor wind power generation system has the advantages of long service life of the vane, small occupied area, low cost for installation and maintenance, favorable reliability, wide application range, low bearing stress, automatic wind resistance and yawing and small stress of the beams; and the rotary bearing or a rotary driving device in the engine room is omitted.