Air conditioner outdoor unit

The utility model discloses an air conditioner outdoor unit which comprises a unit shell. The unit shell comprises a front face plate (3), a rear face plate, a top face plate (7), a bottom face plate (8) and two side face plates, wherein the front face plate (3) and the rear face plate are used for being arranged parallel to a wall (6), the top face plate (7), the bottom face plate (8) and the two side face plates are connected between the front face plate (3) and the rear face plate, and the rear face plate is a sealed face plate. The front face plate (3) and the top face plate (7) are used for being arranged on the face plate part outside the wall (6), the bottom face plate (8) is used for being arranged on the face plate part outside the wall (6) and/or the side face plates are used for being arranged on the face plate part outside the wall (6) and are provided with an air inlet used for feeding air into the unit shell, and an air outlet used for discharging air out of the unit shell. The outer side of a compressor (4) of the air conditioner outdoor unit is covered by a compressor sound insulation cover (5), and the compressor sound insulation cover (5) is located in the unit shell and used for being arranged in a cavity of the wall (6). The air conditioner outdoor unit improves the use comfort of users.