Extensometer and geotechnical cloth testing system

The embodiment of the utility model relates to the technical field of geotechnical synthetic material tensile tests, and discloses an extensometer and a geotechnical cloth testing system.The extensometer comprises a first clamp, a second clamp, a guide rail and a base; the guide rail is vertically arranged on the base; the first clamp and the second clamp are respectively arranged on the guide rail and relatively move along the guide rail; each of the first clamp and the second clamp comprises a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are oppositely arranged through an elastic part, and the side, opposite to the second clamping arm, of the first clamping arm is arranged to be an inclined plane; and when the first clamping arm and the second clamping arm are relatively clamped through the elastic part, one side of the first clamping arm is in linear contact with one side of the second clamping arm. Through the mode, the testing precision of the geotechni