The invention discloses a guide device used for an electric plane. The electric plane is provided with a casing, and a bottom plate arranged on the casing. The guide device is detachably installed on the bottom plate, and is provided with a guide piece used for being matched with a workpiece; a handle is arranged on the guide device; the guide device also comprises a support piece detachably installed on the bottom plate; and the support piece is arranged vertically relative to the guide piece. The guide device is assembled with a back bottom plate of the electric plane through the support piece and then installed on the casing, thereby resulting in solid fixation and accurate positioning. In the working process of the electric plane, the guide piece of the guide device is arranged perpendicular to the bottom plate of the electric bottom plate.