A bearing, comprising a base ring (101), an upper rotating frame (102), a lower rotating frame (103), and a moving assembly. An inner wall of the base ring (101) extends in an axial direction to form a shielding ring (1011). The upper rotating frame (102) is ring-shaped and is sleeved on the shielding ring (1011). The lower rotating frame (103) is ring-shaped and is sleeved on the shielding ring (1011). The lower rotating frame (103) is disposed below the upper rotating frame (102). The moving assembly is disposed between the upper rotating frame (102) and the lower rotating frame (103). The invention also relates to an air conditioner. The bearing and the air conditioner of the present invention achieve functions of a common bearing and have lower costs, thereby achieving a goal of reducing production costs and improving an effect of anti-air leakage of the bearing. The bearing has a wide range of applications. It is applied in the air conditioner to realize rotation of a head assembly of the air conditioner, thereby realizing a goal of enabling the air conditioner to sweep to left and to right, and further reducing air leakage from a sidewall of the bearing.