The invention discloses a cabinet corner protector which comprises a rectangular corner protector made of metal. A bottom support is fixedly arranged at the bottom of the rectangular corner protector, an embedded groove is formed in the middle of one outer side face of the rectangular corner protector, a connecting seat which is turnable is arranged in the embedded groove, the tail end of the connecting seat is in shaft connection with a roller which realizes upward turning and downward turning through the connecting seat, and the roller is positioned below the bottom support when being turned downward and positioned in the embedded groove when being turned upward; two L-shaped inserting connection grooves are formed at a position, on the same side of the embedded groove, of the rectangular corner protector, inserting ports of the inserting connection grooves are upward and are symmetrically arranged on two sides of the embedded groove, and a barrier inserting plate in inserting connection fit with the inserting connection grooves is arranged in the same. The cabinet corner protector can be mounted at four corners of the bottom of a cabinet or other rectangular articles, and padding effect between the cabinet and a placement face can be realized; the runner on the corner protector can be put down, so that convenience can be brought to moving of the cabinet, and the cabinet corner protector is convenient and flexible to use.