Take-up device

The take-up device comprises a winding roll, a base and a clockwork spring, the base is provided with a wire outlet and a containing cavity, the winding roll is arranged in the containing cavity, the first end of the clockwork spring is connected with the base, the second end of the clockwork spring is connected with the winding roll, the winding roll comprises a fixing column, and when the clockwork spring is not stressed, a test wire is wound around the fixing column. When the clockwork spring is not stressed, namely in a natural state, the test wire is wound on the fixed column of the winding roll in advance, when the test wire is pulled out for use, the clockwork spring is stretched and stores energy, once the test wire is used up, the clockwork spring releases energy to drive the winding roll to rotate, the test wire is automatically wound back to the fixed column, and the test wire is automatically wound back to the fixed column. A user can wind the test wire without manually rotating the reel, which is