PURPOSE: An auto-closing pocket sliding door is provided to open and close a door conveniently by closing a door using a weight, to prevent the opening by intercepting the inside and outside by closing a door all the time and to prevent the transfer of internal noise to the outside. CONSTITUTION: The auto-closing pocket sliding door comprises a pocket(1) composed of a twofold soundproofing panel, a door(2) composed of a soundproofing panel, an upper frame(3) connected on the upper part of the pocket(1) and the door(2), and a feed unit(5) provided with a guide rail coupled with a feed roller formed on the upper part of the door(2) in the upper frame(3) to move the door(2) horizontally. A feed passage is formed on a side frame(4) of the pocket(1) formed on the opposite side to the door(2) to make a weight(8) move vertically, and a wire connects the weight(8) and the door(2) and to be guided by a guide roller(10).
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