The invention discloses a circular blowing polyester spinning cooling device. The device is composed of two parts, namely a blowing device and air-conditioning systems; the blowing device comprises a frame, a lifting cylinder, a lifting rod, a first air inlet pipe, a second air inlet pipe, a first air duct, a second air duct and a guide duct; a first annular cavity is arranged outside the first air duct, while a second annular cavity is arranged outside the second air duct and a third annular cavity is arranged outside the third guide duct; a first annular air equalizing cover is arranged outside the first annular cavity, while a second annular air equalizing cover is arranged outside the third annular cavity; the inlet pipeline of the first annular air equalizing cover is communicated with the first air inlet pipe; the inlet pipeline of the second annular air equalizing cover is communicated with the second air inlet pipe; the first air-conditioning system provides the first air inlet pipe with cooling air, while the second air-conditioning system provides the second air inlet pipe with cooling air. According to the circular blowing polyester spinning cooling device, a circular blowing cooling manner is adopted, air can be fed in each direction so that nascent fibers can be evenly cooled in each direction, and meanwhile, the upper and lower layers of circular blowing are evener, and the fiber cooling effect is good.