The invention discloses a broadsword fixture tension test clamping apparatus. The broadsword fixture tension test clamping apparatus is applied to a tensile testing machine for carrying out a tensiletest on a broadsword fixture. The broadsword fixture is formed by detachably connecting a first side plate and a second side plate. A via hole is formed between the first side plate and the second side plate. The width of the via hole is gradually reduced inwards from the triangular bottom edge of the broadsword fixture. A first connecting hole and a second connecting hole are formed in the broadsword fixture. The test clamping apparatus comprises a clamping apparatus body. A pull head is arranged at one end of the clamping apparatus body. A third connecting hole is formed in the end, away from the pull head, of the clamping apparatus body. The length of the pull head is the same as the width of the widest part of the via hole. According to the broadsword fixture tension test clamping apparatus and the test method, the tension test on the broadsword fixture by means of the test clamping apparatus and the tensile testing machine can be conducted. Therefore, the local permanent cumulative damage of the broadsword fixture due to metal fatigue after long-term use is effectively detected. The personal safety of an operator in the maintenance work of a power transmission line is ensured.