Self-checking grading early warning nut

The utility model relates to the technical field of nuts, in particular to a self-check graded early warning nut. Comprising a shell, a warning lamp system, a circuit system and a warning lamp triggering device, the warning lamp system, the circuit system and the warning lamp triggering device are all arranged in the shell, and the warning lamp triggering device is electrically connected with the warning lamp system through the circuit system. The early-warning nut mainly solves the problems that an existing early-warning nut cannot monitor the quality of the early-warning nut and the early-warning nut cannot be found after being damaged in the using process. According to the utility model, the in-place installation degree of the device can be determined, and the device has a grading early warning function and a self-checking function and is energy-saving and environment-friendly. The device is mainly used for detecting whether the tower crane bolt is loosened or not. 本实用新型涉及螺母技术领域，更具体而言，涉及一种可自检的分级预警螺母。包括：外壳、