Leakage detection tool based on stop valve

The invention discloses a leak detection tool based on a stop valve, which comprises a bracket, a rotatable mounting rod arranged at the end part of the bracket, a mounting frame fixed on the mounting rod, and pre-clamping assemblies arranged on the mounting frame and distributed in the circumferential direction, and is used for limiting and mounting a stop valve body; the pre-clamping assembly comprises a first fixing plate, the first fixing plate is fixed to the outer wall of the mounting frame, and a resisting assembly is arranged on one side of the first fixing plate and used for limiting and fixing the stop valve body; and the sealing leak detection assembly is arranged on the other side of the first fixing plate and is used for detecting the stop valve body. The stop valve body is limited and clamped through the arranged pre-clamping assembly, namely under the mutual cooperation effect of the resisting assembly and the sealing leakage detection assembly, the sealing connection and positioning installati