Abstract: Provided is an underground laid electric equipment container system including: a box that is laid underground in the form of an opened manhole; a box holder that comprises a horizontal frame that is coupled to an upper surface of the buried box in an sealed state and an inner vertical frame that is upwardly bent from an inner edge of the horizontal frame; a cover, to which a waterproof band covering the entire upper portion of the inner vertical frame is attached, wherein coupling devices with an upper surface of the horizontal fame that allow adhesion between the upper portion of the inner vertical frame and the waterproof band are installed on the cover; and an electric equipment box that is disposed in sealed inner space of the buried box that is formed as the upper portion of the inner vertical frame and the waterproof band are adhered to each other by user's manipulation.