Stretching system capable of measuring tension of fastener and testing device

The invention discloses a stretching system capable of measuring the tensile force of a fastener and a testing device, and the stretching system comprises a fastener stretching mechanism located in a first frame and a tensile force detection mechanism located in a second frame, the tension detection mechanism comprises a first fixing plate, a second fixing plate, a pressure sensing device, a sliding rail and a tension calculation module; after hydraulic pressure is applied to the interior of the tensioner body, the tensioner body stretches the fastener to be tested and meanwhile applies pressure towards the first fixing plate to the second fixing plate, and the tension calculation module obtains the tension applied to the fastener to be tested by the tensioner body according to pressure information transmitted by the pressure sensing device. The stretching system is high in integration level, can accurately control the stretching force of the fastener, and can timely obtain the value of the tensile force born