A peel testing device designed to test the resistance to peeling of test pieces each formed from a support and from a reinforcement glued to this support, and comprising a frame with a face roller and at least one guide roller, a traction machine configured to peel the reinforcement from the surface of the support in a peeling direction tangential to the face roller and a sensor for measuring the force exerted by the traction machine during peeling, the device also comprising a fastening cable connected, on the one hand, to the traction machine and on the other hand to the face roller with which it forms a pulley system and the face roller which has a greater diameter than that of the guide roller comprises a mounting element for holding the reinforcement fixedly there.