Measuring device for pretightening force of connector

The utility model provides a measuring device for a pretightening force of a connector. The measuring device comprises strain foils, an angle sensor, a pressure sensor, wires and a measuring mechanism. The strain foils are attached to the outer surface of the sleeve wall of a sleeve. The pressure sensor is pressed between a first surface and a connected member by the connector. The angle sensor is connected with the sleeve in a synchronous rotation manner. The measuring mechanism is in a communication connection with the strain foils, the pressure sensor and the angle sensor through the wires and thus obtains the torque applied during pretightening from the strain foils, the axial turning angle alpha from the angle sensor and the axial pretightening force F from the pressure sensor and controls the axial pretightening force F of the connector according to the relational expression of F=K*a for completing the installation. The measuring device can control the pretightening force of the connectors such as bolts