The invention discloses a building communication cabinet automatic control device which comprises a cabinet. The cabinet is internally and fixedly provided with an intelligent controller, a power distribution box, a switch, a wire arrangement frame, a distribution frame, a fibre distribution frame, a PDU, an optical transceiver, an access controller and a UPS and matching power source thereof from the top down in sequence by means of trays. The power distribution box is electrically connected with the intelligent controller through a current and voltage detector. The cabinet is further internally provided with a temperature detector, a humidity detector, a smog detector, a water logging detector and an alarm, which, together with the access controller, are electrically connected with the intelligent controller. The intelligent controller is connected with a remote monitoring system terminal through a network. The cabinet of the device is in standard design; port and device installation are increased and added as needed; sufficient redundancy design is realized; different devices are in subarea arrangement in structure; the distribution frame and the wire arrangement frame are made full use of; and therefore, anti-interference between wires is realized, the cabinet realizes UPS integrated self-powering; and the cabinets in the network are interconnected through the intelligent controller, and intelligent centralized management is realized.