The utility model relates to an integrally-molded lightning arrester. The integrally-molded lightning arrester comprises a lightning arrester housing, and an upper electrode, a resistance sheet and a lower electrode, which are sequentially arranged in the lightning arrester housing, and the integrally-molded lightning arrester comprises a first aluminum powder layer which is arranged between the upper electrode and the resistance sheet and a second aluminum powder layer which is arranged between the lower electrode and the resistance sheet. The integrally-molded lightning arrester has the beneficial effects that the local discharging phenomenon caused by the poor contact of the lightning arrester in the manufacturing process can be solved, and the non-environment-friendly factor caused by lead skin can be solved. More environmental friendliness can be realized; moreover, the qualification rate of products can be improved.