Adjustable gap detection device

The invention discloses an adjustable gap detection device. The adjustable gap detection device comprises a frame body; the frame body is provided with four side plates, a supporting plate is arranged in the frame body, the top edge of the supporting plate is used for supporting the bottom surface of an upper panel, and a gap to be detected is formed between the top edges of the side plates and the edge of the upper panel; each side plate comprises two sub-plates which are spliced in the horizontal direction and a splicing mechanism for splicing the two sub-plates; the splicing mechanism comprises at least one sliding rail arranged on one sub-plate, at least one guide rod arranged on the other sub-plate and at least one locking piece, the guide rod is slidably connected with the sliding rail, and the locking piece can lock the guide rod on the sliding rail. The panel detection device has the beneficial effect that the panel detection device can adapt to detection of panels with different specifications and si