The invention relates to an inclination warning device. The inclination warning device comprises a shell, a fixing plate, a metal inner shell, a metal cone and an internal circuit, wherein an LED warning lamp is fixed to the top of the outer wall of the shell, and a circular level is fixed to one side face of the outer wall of the shell; an end face, away from the circular level, of the shell is connected with the fixing plate, and three fixing screws for fixing are arranged on the side, away from the shell, of the fixing plate; the metal inner shell is fixed in the mounting space; the metal cone is initially and vertically arranged in the metal inner shell; and the outer part of the internal circuit is inclined, so the metal cone is in contact with the metal inner shell, the internal circuit is closed, and the LED warning lamp is turned on. The device is simple in installation, is beneficial to real-time monitoring and timely warning of the inclination change of the carrier in an early stage, greatly improves safety of the carrier, provides safety guarantee for carrier construction, and reduces dependence of manual operation and the labor cost.