Device convenient for replacing protective tube

The invention provides a device convenient for replacing a protective tube, which comprises a first test wire and a second test wire which are respectively provided with a first end and a second end and are correspondingly provided with a first electrode and a second electrode respectively penetrating through a first connecting piece and a second connecting piece, and further comprises a rotating piece rotationally connected with the first test wire and the second test wire, and a plurality of mounting through holes are formed in the rotating piece. The rotating part is used for installing the protective tube, the rotating part further comprises an elastic assembly and a corresponding clamping groove, the rotating part has a first state and a second state, in the first state, the elastic assembly is clamped with the clamping groove, the two ends of the protective tube are electrically connected with the first electrode and the second electrode, and in the second state, the elastic assembly abuts against the e