The invention relates to the technical field of cooking equipment and discloses steam cooking equipment and a steam discharging device thereof. The steam discharging device comprises a plate overturning assembly (12), a plate overturning rotating shaft (13) and a plate overturning controller (14), wherein the plate overturning controller (14) can control the plate overturning assembly (12) to rotate around the plate overturning rotating shaft (13) between the closing position and the opening position. By means of the technical scheme, the plate overturning assembly can be easily and conveniently controlled to rotate through the plate overturning controller to discharge steam in the steam cooking equipment out of the equipment so that a user can be prevented from being scalded by the hot steam when the steam cooking equipment is opened, convenience and fastness are achieved, the cooked food is not influenced, and the use safety and the user experience sensation of the steam cooking equipment are improved.