The utility model discloses a cable intermediate layer that is used for extra -high voltage current conversion station control building, including cable intermediate layer roof and cable intermediate layer bottom plate, cable intermediate layer roof and cable intermediate layer bottom plate are arranged and form the cable intermediate layer that is used for the cabling between cable intermediate layer roof and the cable intermediate layer bottom plate between control building basis and one deck framed floors, have offered the cable hole on the framed floor under equipment and the screen cabinet, and the cable of jointing equipment and screen cabinet gets into the cable intermediate layer through wearing the cable hole, effectively avoided because the electric screen cabinet that foundation uneven settlement probably arouses inclines, compensatied the not enough of steel shotcrete + anti quiet electrical activity floor poor stability, compare with the cable pit, cable clamp in situ installation operating space is big, and the cabling is convenient, has improved cable laying's installation progress, has practiced thrift construction period.