Pretightening force measuring system and method of bolt set connection

The invention provides a pretightening force measuring system and method of bolt set connection. The system comprises a gasket type force sensor, a testing box connected with the gasket type force sensor, and processing equipment connected with the testing box, wherein the gasket type force sensor is provided with a hole for penetration of a bolt, when the bolt is screwed up, obtained pretightening force signals are transmitted to the testing box, signal conditioning is carried out on the pretightening force signals by the testing box, and the pretightening force signals after the conditioning are transmitted to the processing equipment to be processed. According to the pretightening force measuring system and method, measurement is convenient, the pretightening force in the screwing-up process of a bolt set and after the screwing-up process is monitored in on-site, shaking and other environments, and the pretightening force measuring system and method is portable to be used for measuring.