Fresh air assembly and air conditioner

The utility model discloses a fresh air assembly and an air conditioner, the fresh air assembly comprises a first shell, a wind wheel and a second shell, and a worm wheel cavity is formed in the first shell; the wind wheel is rotatably arranged in the worm wheel cavity; the second shell is arranged on the first shell, and an air inlet channel is defined between the second shell and the first shell. Wherein a ventilation opening communicated with the worm wheel cavity is formed in the first shell, an air inlet is formed in the second shell, the air inlet is communicated with the ventilation opening through the air inlet channel, and the sectional area of the air inlet channel is gradually reduced in the direction away from the air inlet. According to the fresh air assembly, due to the fact that the sectional area of the air inlet channel is gradually reduced in the direction away from the air inlet, air which rotates and flows back can be reduced, the air volume loss is reduced, and the air outlet efficiency i