The invention discloses a safety signboard suitable for a secondary bin of a switch cabinet. The safety signboard comprises a special signboard; a warning icon is arranged on the front surface of thespecial signboard; the safety signboard further comprises a magnetic attraction type outer cover; an open end is arranged on the magnetic attraction type outer cover and is provided with a first magnet; a second magnet is arranged outside the magnetic attraction type outer cover opposite to the opening end; the first magnet is fixed to the magnetic attraction type outer cover; the second magnet isfixed to the magnetic attraction type outer cover; a magnetic metal plate is arranged on the back surface of the special signboard; the magnetic metal plate is fixed to the special signboard; and themagnetic metal plate is adsorbed on the magnetic attraction type outer cover through the second magnet. The safety signboard suitable for the secondary bin of the switch cabinet has the advantages ofbeing simple in structure, fast to mount, reliable and stable to fix, difficult to separate and the like; and a switch operation handle can be completely sealed in the magnetic attraction type outercover to prevent working personnel from touching the handle by mistake.