The invention relates to a clamp and a testing machine for CGA tensile strength test. The clamp comprises a clamping seat, a first clamping jaw and a second clamping jaw. The clamping seat is used forbeing fixed on a testing machine body. One end of the first clamping jaw is connected to the clamping seat, a first clamping surface is arranged on the first clamping jaw, and the first clamping surface is provided with a first arc-shaped groove and a first friction abutting part. One end of the second clamping jaw is connected to the clamping seat, a second clamping surface which is opposite tothe first clamping surface is arranged on the second clamping jaw, the second clamping surface is provided with a second arc-shaped groove and a second friction abutting part, the first arc-shaped groove and the second arc-shaped groove are oppositely arranged, and the first friction abutting part and the second friction abutting part are oppositely arranged. According to the clamp and the testingmachine for the CGA tensile strength test, a welding column can be clamped and fixed without damaging the clamp, and the accuracy of the CGA tensile strength test is improved.