Wind power generation speed increasing box

The invention discloses a wind power generation speed increasing box, which adopts secondary planetary transmission and primary parallel shafts, a gear 4, a planetary gear 5 and an annular gear 6 form primary planetary gear transmission, a gear 17, a planetary gear 11 and an annular gear 10 form secondary planetary gear transmission, a gear 12 and a gear 15 are in parallel shaft gear transmission, a center shaft 1, a planetary gear rack 7 and the annular gear 10 are connected together, and the gear 4 and a planetary gear rack 9 are connected together. The primary gear and the secondary gear can simultaneously bear the torque of blades so as to realize load shunt. An elastic element and a damping element are arranged between the elements of the speed increasing box, elastic damping is infused to form extra freedom degree and further reduce the influence of load impact. The invention can reduce impact vibration, reduces the failure rate, prolongs the service life, and is particularly suitable for the wind power generation speed increasing box.