The utility model belongs to the technical field of the crack resistance of the asphalt pavement of highway engineering and discloses a testing device for cracking of asphalt pavement materials. The testing device comprises an asphalt-mixture testing piece, a parallel clamp, a U-shaped clamp and a clamping type extensometer arranged on the surface of the asphalt-mixture testing piece, wherein one end of the parallel clamp is fixed at the upper part of the asphalt-mixture testing piece, and the other end of the parallel clamp is fixedly provided with an upper sleeve; the opening end of the U-shaped clamp is fixed at the lower part of the asphalt-mixture testing piece, and one end of the U-shaped clamp, which is far away from the opening, is fixedly provided with a lower sleeve; the signal output end of the clamping type extensometer is electrically connected with a microprocessor.