A sealable powder box of the present application comprises an upper casing, a lower casing, an inner casing mounted in the upper casing, a storage box mounted in the lower casing, and a tray arranged in the storage box. The sealable powder box further comprises a gasket, the gasket is arranged in the tray by means of injection molding, or is sandwiched between the tray and the storage box and engaged with the tray. The inner casing is mounted in the upper casing, and the top part of the inner casing penetrates the top part of the upper casing. The upper casing and the inner casing are axially slidable and radially rotatable relative to each other, the storage box is engaged in the lower casing and threadingly connected with the upper casing, and the inner casing and the tray are rotatably connected with the lower casing by a pin.