The invention provides an emergency power source access box which comprises a box body, a box door and a socketing faceplate arranged inside the box body. The socketing faceplate comprises socketing portions provided with sockets, and the socketing portions extend from the lower portion to the upper portion of the box body and incline towards the direction of the box door. According to the emergency power source access box, the socketing portions extending from the lower portion to the upper portion of the box body and inclining towards the direction of the box door are adopted, so that emergency repairing personnel can quickly connect a cable plug of an emergency power generation vehicle onto the sockets on the emergency power source access box. In addition, the inclined socketing portions enable big mutual acting force not to be generated between the cable plug and the sockets of the socketing portions due to the gravity of a cable, so that the objective of protecting the cable plug and the sockets of the socketing portions is achieved.