Low -pressure control case emergency power source access device belongs to access technical field, especially relates to a low -pressure control case emergency power source access device. The utility model provides a connect convenient, the reliable low -pressure control case emergency power source access device of power supply. The utility model discloses a box is provided with in its structural feature box the inside vertical septum who divide into left room and right room of box, is provided with the left -hand door on the box of left room front end, is provided with right side door on the box of right room front end, left side room middle part is provided with left mounting bracket, and left mounting bracket both ends link to each other with vertical septum with the box inner wall respectively, are provided with the double -throw switch on the left mounting bracket, and left mounting bracket upper end is provided with inlet wire power connection terminal, and left mounting bracket lower extreme is provided with emergency power source connecting insertion hole, inlet wire power connection terminal and the first wiring of double -throw switch end links to each other, emergency power source connecting insertion hole with the second wiring end of double -throw switch links to each other.