The invention relates to a method for increasing a thermal response speed of a low-voltage arrester and belongs to the field of arresters. A built-in hot melting separation component is arranged on the lower end of a low-voltage arrester main body; a bowl-shaped rubber sleeve is arranged on the periphery of a lower polar plate of the low-voltage arrester main body; a central hole is formed at thecenter of the bowl-shaped rubber sleeve; a guide pipe is arranged in the central hole of the bowl-shaped rubber sleeve; the built-in hot melting separation component is coaxially arranged in the guidepipe. According to the method for increasing the thermal response speed of the low-voltage arrester, the bowl-shaped rubber sleeve structure is arranged on the periphery of the lower polar plate, soas to effectively reduce the fault heat loss of the arrester, guarantee sufficient heat for making a low-temperature hot melt medium layer enter into semi-molten softening state or molten state when the low-voltage arrester is in internal fault, and avoid the response hysteresis for separator action caused by the fault heat loss of the arrester. The method can be widely applied to the fields of design, manufacturing or operating maintenance of low-voltage arresters under working voltage below 1kV-0.5kV.