An electric control box includes a box body. The box body includes a bottom plate, a box cover covering the bottom plate, an electric control assembly mounted at the bottom plate and including an electric control board and a heat sink mounted at the electric control board, and a sealing sleeve sleeved on a circumference of the heat sink. The box cover is provided with an extension opening for the heat sink to protrude outward. An inner surface of the box cover is formed with a sink groove on a circumference of the extension opening, and the sink groove is fitted and engaged with the sealing sleeve.