The small crack sealing machine adopts the liquefied gas heating system, and the heat transfer oil circulates, so that the asphalt or sealants can be melted quickly, and the material is discharged from the discharge port through the pressure of the asphalt pump to achieve the effect of crack treatment. Through the pressure injection type grouting, the material and the joint wall are closely combined, and the flexible universal wheel follows the crack, so that the grouting effect is beautiful. Since the filling material uses asphalt or sealants, it is easy to solidify when the temperature is low. The crack sealing machine is equipped with a Yamaha generator set to provide the power of the whole machine. The crack sealing machine adopts a constant temperature control system in the discharge pipe to avoid material burning and aging, ensuring that Smooth delivery.