The invention discloses a clamp for detecting the tensile property of a brittle plate. The clamp comprises a synchronous seat and two parallel clamping rollers, roll shafts of the clamping rollers areconnected with the synchronous seat through swing arms respectively, the two ends of each swing arm are hinged to a roller shaft of the corresponding clamping roller and the synchronous seat respectively, hanging holes are formed in the clamping rollers in the radial direction in a penetrating mode respectively, the hanging holes in the two clamping rollers correspond to each other, and the samehanging shaft is arranged in the hanging holes in the two clamping rollers in a penetrating mode. The clamp has the advantages that the contact area between the clamping part and the plate is greatlyreduced; the structure of the clamping part of the brittle plate can be prevented from being damaged during large-area contact; the plate can be prevented from being sheared and damaged; the applicability is high; and thus, the tensile property of the calcium silicate brittle plate can be detected more accurately and objectively.