The invention discloses a high-pressure air flotation grinding rotary shaft technology for dry type nano grinding. The high-pressure air flotation grinding rotary shaft technology comprises the high-pressure air purifying and drying technology, the high-pressure air flotation shaft technology and the high-pressure air flotation labyrinth air seal bearing technology, and a shaft, a shaft sleeve, air flotation wings, a high-pressure air flotation labyrinth air seal bearing and the like are involved. The high-pressure air flotation grinding rotary shaft technology is characterized in that through the high-pressure air flotation shaft technology combining the shaft, the shaft sleeve and a shaft sleeve shaft pipe and the high-pressure air flotation labyrinth air seal bearing technology, high-pressure clean air is inflated into the high-pressure air flotation labyrinth air seal bearing, a high-pressure air mass bearing with the shaft sleeve and the shaft being in no physical contact with the bearing is achieved under the action of an air seal labyrinth body with a labyrinth air chamber and the air flotation wings, and powder materials are effectively prevented from overflowing. The ground-breaking key technology is provided for dry type nano grinding, long-time operation of a dry type nano grinding shaft is achieved, and defects in the prior art are overcome.