The utility model discloses a folding folding adapting piece for cabinet, including vice, the connector of two bolts, adapter sleeve, bolt, nut and two slide openings, the connector is chute -shaped body, the front end upper portion of two cell walls body of connector all is equipped with the fixed body, side wall body through two bolts vice respectively with fixed body fixed connection, the lowerpart of two cell wall bodies of connector all is equipped with corresponding slide opening, the adapter sleeve passes through supporter fixed mounting on the base, the adapter sleeve is located the recess of connector and corresponding with the slide opening, the inserting the slide opening on another cell wall body of slide opening, adapter sleeve and connector on the cell wall body that the endpassed the connector in proper order and be equipped with the nut at the end that inserts of bolt of bolt, nut fastening back bolt can slide in the slide opening, compares with prior art, and can theflexibility good, the firmness be high, convenient to use to has the advantage of preventing down.