Surface defect marking tool for hot-rolled strip steel coil

The utility model discloses a hot rolling strip steel coil surface defect marking tool, which belongs to the field of steel production detection auxiliary accessories and comprises a main ruler, a clamping sleeve, an angle measurer, a point laser and a high-temperature chalk. A high-temperature chalk is arranged at the front end of the main ruler, a limiting rod is vertically connected to a 0 mm scale position of a ruler head of the main ruler, a clamping sleeve is sleeved on the main ruler, a reading window is arranged on the clamping sleeve corresponding to the scale position of the main ruler, and an angle measurer is arranged on the clamping sleeve; a threaded through hole is formed in the circle center of the angle measurer, and the position of the threaded through hole is equivalent to that of the circle center of the angle measurer; a through hole is formed in the middle of the dot laser, and the fastening bolt penetrates through the through hole to be connected with the threaded through hole; a laser