Big data host placing rack with extended function

The utility model belongs to the technical field of placing frames, and particularly relates to a big data host placing frame with an expansion function, which comprises a rotating assembly, an extension assembly arranged at the top of the rotating assembly and an expansion assembly arranged in the rotating assembly, the rotating assembly comprises a first case, a first knob, a first rotating rod and a first clamping block, the first knob is located at the central position of the left end surface of the first case; during use, firstly, a user places the host on the drawing plate, when an interface plugging cable at the back of the host needs to be in butt joint with a display screen subsequently, the user can pull a part of the drawing plate outwards at the moment, then the user rotates a second rotary knob, the second rotary knob drives a second rotary rod to rotate, and then a second supporting foot is driven to rotate; at the moment, the third clamping block is not clamped with the second supporting leg, a