The utility model discloses a road traffic uses crack heat sealing machine, including heat preservation cover, air cylinder supporting frame, cylinder, pressurizing block and air pump, movable mounting has the telescopic link in the cylinder, the piston has been cup jointed on the telescopic link, cylinder surface one side is equipped with air inlet and gas outlet, the cylinder surface deviates from one side of air inlet and installs magnetic switch through the magnetic switch mount, pressurizing block movable mounting is in in the heat preservation cover, it deposits the case to be equipped with heating oil in the pressurizing block, heating oil is deposited the incasement and has been filled heating oil, the thermal resistance has been placed in the heating oil, the cover intussuseptionthat keeps warm is filled with the insulation fibre, the cover top surface thread tightening that keeps warm there are rings, the air pump welding is in the top surface who keeps warm and cover, thereis the motor in gas pump top portion through motor scaffold weldment, there is magnetism switching -over valve in gas pump top portion through switching -over valve bracket movable mounting, the utility model discloses possess the high efficiency, need not artifical advantage of repairing.