The utility model discloses an auxiliary device that is used for being convenient for settle internal large -scale subassembly of cabinet in narrow space, the device include two at least supporting seats, are equipped with the slide that the slope set up respectively downwards on the top of every supporting seat, and adjacent slide passes through the connecting plate to be connected, and the slide is opened has the recess that is on a parallel with slide itself. The utility model discloses a set up decurrent slide of slope and supporting seat for large -scale subassembly can glide in the space of settling in advance along the slide is direct, and is simple and convenient, through the setting of recess, can cooperate the gyro wheel, more the arrangement of the convenient and quick large -scale subassembly of realization, perhaps large -scale subassembly is realized settling fast through the cooperation with the cardboard by the recess, rotatable in the slide setting through the landing leg, the space of not only being convenient for practice thrift when settling large -scale subassembly, need not to raise the higher height of large -scale subassembly moreover, and is very convenient.