Online monitoring device for fastening degree of high-strength bolt

The invention discloses an online monitoring device for the fastening degree of a high-strength bolt, and belongs to the field of online monitoring. The device comprises a bolt, a tubular strain sensor is fixedly arranged in the bolt, a signal transmission line of the tubular strain sensor extends out of the bolt, the signal transmission line is connected with a signal collecting and processing module, and the signal collecting and processing module is connected with a single-chip microcomputer MCU; the signal collecting and processing module is used for receiving and processing signals of thetubular strain sensor and sending the signals to the single-chip microcomputer MCU. the single-chip microcomputer MCU is used for comparing the received signal with a set value, and sending an alarmsignal when the received signal deviates from a preset range of the set value. The device is simple in structure, high in universalization degree and capable of meeting the use requirements of variousindustrial fastening scene