The invention provides an air conditioner indoor unit capable of reversibly supplying air and an air conditioner. The air conditioner indoor unit comprises a shell, a first air opening, a second air opening and a fan set, wherein an internal air channel is formed in the shell, one end of the internal air channel communicates with the first air opening, the other end of the internal air channel communicates with the second air opening, and the fan set is arranged in the internal air channel; the fan set comprises a first axial flow fan blade and a second axial flow fan blade, and the first axial flow fan blade is arranged close to the first air opening, and the axial direction of the first axial flow fan blade faces the first air opening; and / or the second axial flow fan blade is arranged close to the second air opening, and the axial direction of the second axial flow fan blade faces the second air opening. According to the air conditioner indoor unit, the purpose of improving the heatexchange effect in a room can be achieved whether in summer or winter, the shower-type upward air exhaust is achieved through refrigeration in summer, the carpet type downward air exhaust is achievedthrough heating in winter, airflow impact loss caused by air exhaust or air intake can be avoided or reduced, the air supply distance is improved, and remote air supply is facilitated.