The present invention relates to a sliding device for a desk cable arrangement cover, and more particularly, to technology to easily procure the space required for desk cable arrangement by sliding the cover plate to open and close the device and improve convenience due to simple operation. A sliding device for a desk cable arrangement cover according to the present invention is composed of: a desk 10 on one of the corners of which an arrangement hole 12 and a cover plate 15 placed to the arrangement hole 12 are configured; a housing 20 that is attached to the lower surface 11 of the said desk 10 and fitted with wing parts 22 to procure housing space 21 within it; a cover rail 30 that extends a vertical plate 32 downward from its upper assembling surface 31 to be integrated to the lower surface of the said cover plate 15, wherein a long slide hole 33 is formed in the vertical plate; a guide pin 40 that moves along the slide hole 33 in the said cover rail 30; supporting plates 41 that are placed on the two sides of the vertical plate 32 of the said cover rail 30 and are to be fastened with the said guide pin 40; a rotating unit 50 that includes a inserting slot 51 to be placed inside the housing space 21 of the said housing 20, where an end of the rotating unit is to be assembled by and rotate on a fixing pin 52 while the other end are to be fastened and fixed, on the outer surfaces of the said supporting plates 41, by the guide pin 40; and a torsion spring 60, to be inserted into and fixed by the inserting slot 51 of the said rotating unit 50, where an end of the torsion spring is to be supported on the inner wall of the housing space 21 while the other end of it is to be supported by the rotating unit 50, which ensures the rotating unit 50 to possess elasticity exerted toward the upper plate 11, wherein a rotation restriction unit is configured including stopping shoulders 23 formed at the ends of the wing parts 22 of the said housing 20 and stopping projections 34 formed on the upper assembling surface 31 of the said cover rail 30 in order to prohibit the rotational movement of the cover rail 30, when the end of the cover rail 30 is displaced toward then maintained inside the housing 20, by restraining the stopping projections 34 by means of the stopping shoulders 23; and rotating wings 53, containing rotating space extending from one end to the inserting slot 51, are further prepared in the rotating unit 50, which ensures the cover rail 30, assembled with the cover plate 15 at one end of the inserting slot, to rotate inside the rotating space.