Air conditioner drainage device, air conditioner indoor unit and air conditioner

The invention provides an air conditioner drainage device, an air conditioner indoor unit and an air conditioner, the air conditioner drainage device comprises a water pan and a drainage pipe, a drainage hole is formed in the bottom wall of the water pan in a penetrating mode, the drainage pipe is located below the bottom wall in the vertical direction, the water inlet end of the drainage pipe communicates with the drainage hole, and an air bag is arranged on the drainage pipe; the air outlet end of the air bag is communicated with the air inlet of the drainage pipe, and the air bag is located above the drainage pipe in the vertical direction. By means of the air conditioner drainage device, a user can conveniently and rapidly dredge blockage of the water pan and the drainage pipe, the user can dredge blockage of the water pan and the drainage pipe by himself/herself, professional after-sales personnel do not need to conduct on-site dredging operation, and therefore the dredging and cleaning efficiency of air