The utility model discloses a horizontal transportation device for metro station construction through a cover-excavation top-down method. The device comprises two hoops, a cross beam, a walking beam,an electric hoist and an electric hoist limiting device, the hoop comprises two hoop sheets and a bracket; the two hoop pieces form a circle to surround the steel pipe column, and the adjacent positions are connected through high-strength bolts. The bracket is composed of a supporting plate and a supporting plate, and the inner end of the supporting plate is fixed to the outer circumferential faceof one hoop piece. The upper ends of the two supporting plates are fixed to the two sides of the bottom face of the supporting plate respectively, and the inner ends are fixed to the outer circumferential face of the hoop piece. The two ends of each cross beam are arranged on the surfaces of the supporting plates of the hoops on the two adjacent steel pipe columns; the upper end of the walking beam is fixed on the bottom surface of the cross beam; the electric hoist is suspended in the middle of the walking beam, and electric hoist limiting devices are arranged at two ends of the walking beam. The horizontal conveying device can be used for horizontally conveying construction materials, so that the use of labor force is reduced; transportation of construction materials in cover and excavation construction is accelerated, operation is easy and convenient, safety and reliability are achieved, and the construction efficiency is improved.