The utility model provides a problem, its technical essential is: that coal plough planer tool mechanics characteristic online test system, fundamentally have solved mechanics characteristic data under the unable measuring coal plough operating mode said coal plough tool bit includes the blade holder, sets up at the carbide of blade holder front end tool bit, and safety cover and setting the cutter arbor blade holder bottom of assembly on the blade holder, the blade holder middle part is equipped with the square hole, and vibration sensor places in the square hole through strong magnetism base, be equipped with the gap between the afterbody of blade holder and the cutter arbor, the square hole is cubic scapus with the blade holder front end, processes the film trap of meeting an emergency on four sides at it to interior the foil gage I-III that installs respectively at the film trap of meeting an emergency, wall mounting foil gage III in before the square hole, the U-shaped casing of safety cover for having the hook-type structure inlays on the blade holder outer wall through the blade holder front portion, and its hook-type structure card is at the blade holder rear portion to fasten with countersunk screw. It has simple structure, and convenient to use easily controls, and data detection is directly perceived, testing result advantage such as reliable.