The utility model discloses a tensile cutting device that detects of copper wire, including the wire drawing machine case, its characterized in that: the right -hand member of wire drawing machine case is equipped with outlet wire port, fixed mounting has upper and lower baffle on outlet wire port's the upper and lower both sides wall, be equipped with two upper and lower infrared probe on outlet wire port's the lateral wall, two upper and lower infrared probe connect main control unit, two upper and lower baffle surface mounting's of main control unit control connection cylinder block. The utility model discloses simple structure can in time detect out the copper wire of problem in the drawing process, be convenient for in time cut off get rid of.