The invention discloses a separable maintenance socket box, which comprises a fixed power box and a separable socket. The fixed power box and the separable socket are of a separable structure. The fixed power box comprises a cable joint box, a special cable and a power box. The separable socket comprises an electrode, an insulating conductor and a socket. The power box is internally provided withan electrode jack; the electrode jack and the power box are sealed through a flexible sealing piece; the inner end of the electrode jack is provided with a conducting strip; a cable head is arranged on the inner wall of the power box; the conducting strip is connected with the cable head through an internal wire; the cable head is connected with a cable connector box through a special cable; an electrode matched with the electrode jack is arranged on the outer wall of the power box; and the electrode is connected with the socket through the insulated wire. The socket box has the advantages that the socket box is composed of the fixed power box and the separable socket; and compared with a common maintenance socket box, the socket box is small in protection range of a housing around the socket box, is only limited to protection of the electrode jack, is low in protection cost, can be fixedly installed in a severe environment site, and is suitable for places with narrow installation spaces.