The utility model provides a switch mechanism case box suitable for adverse circumstances belongs to switch mechanism case protection device field, including switch mechanism case, it passes through the support and fixes at the outer container internally to be equipped with switch mechanism case, be equipped with the perforation on the outer box, the cable passes to perforate and is connected to switch mechanism case, be equipped with the heater strip on the internal bottom of outer container, the internal bottom of outer container intermediate position is equipped with the through -hole with external intercommunication, be equipped with the fan on the through -hole, outer box top is equipped with rain -proof cover, rain -proof cover bottom is equipped with the venthole, the box lateral wall is equipped with the inlet port, the inlet port is equipped with electronic tripe, electronic tripe, fan and heater strip all are connected to the power through controlling means, can effectually avoid case short circuit of switch mechanism and corrosion.