The invention discloses an electric-control skylight capable of being automatically opened under power failure. The electric-control skylight comprises a window frame and louvers which are rotatably connected in the window frame, wherein the left sides of the louvers are rotatably connected with the inner side of the left side wall of the window frame through pin rolls; distances between the pin rolls and the rear side walls of the louvers are greater than those between the pin rolls and the front side walls of the louvers; the upper end surface of the right side wall of the window frame is fixedly equipped with a linear motor; a connecting mechanism for connecting the louvers for enabling the louvers to rotate in the window frame around the pin rolls is mounted on a secondary stage of thelinear motor; and an electromagnetic lock for locking the louvers when the louvers are closed is arranged on the upper end surface of the rear side wall of the window frame. Compared with the prior art, the electric-control skylight has the advantages that a power supply is accessed, the linear motor acts, the skylight is automatically closed and is stopped at a closed position for a long time, and the linear motor does not consume power continuously by interrupting the power supply after the skylight is closed. When a fire disaster occurs to cause power interruption, the skylight must be opened automatically, so that the energy-saving and environment-friendly purpose is achieved.