The utility model relates to a high-and-low-floor transitional close-up bar, which belongs to floor decorative materials, comprising a base and a faceplate, wherein the faceplate is arc and slightly flexible, antiskid gears are arranged on the surface and ratchet latch is arranged at the right bottom; a groove is arranged at the left side of the base, barbs are arranged in the groove. The ratchets of the latch is matched with the barbs in the groove, so the latch is not easy to be pulled out from the groove once the latch is inserted into the groove. Because of the ratchets of the latch and the barbs in the groove in the base, the faceplate is matched with the base and faceplate will be pressed more firmly without loosing, and then flexible arc faceplates can connect high floors with low floors. The high-and-low-floor transitional close-up bar is easy to fix, safe to use and good in decorative effect.