The utility model relates to the technical field of defect detection, in particular to a tinned
copper wire surface defect detection device which comprises a supporting seat, a control box, a detection box, four mounting seats, a wire guide wheel, a controller and an industrial display screen, the control box is fixedly connected to the supporting seat, the detection box is fixedly connected to the upper portion of the supporting seat, and the four mounting seats are fixedly connected to the detection box. A wire guide wheel is rotatably arranged on the mounting seat, a controller is mounted on the detection box, an industrial display screen is mounted on the controller, and the controller is electrically connected with the industrial display screen. The tinned
copper wire extrudes the arc-shaped clamping plate to move outwards, meanwhile, the arc-shaped clamping plate drives the
threaded rod and the two guide rods on the arc-shaped clamping plate to move outwards, and the elastic piece is compressed and rapidly rebounds, so that the elastic piece drives the
threaded rod, the two guide rods and the arc-shaped clamping plate to move inwards, and the tinned
copper wire is limited and fixed; therefore, the tinned
copper wire can be prevented from being broken due to uneven tension, and the quality of the tinned
copper wire is prevented from being affected.