The invention discloses a remote monitoring system for a communication machine room of a transformer substation. The remote monitoring system comprises a speech collection device, a speech analysis device, a camera, an image analyzer and an electromagnetic interference device, wherein the speech collection device has a normal working mode and is used for collecting speech information in the communication machine room and sending the speech information to the speech analysis device under the normal working mode; the speech analysis device is used for receiving the speech information, analyzing whether key words exist in the received speech information and sending a first starting order to the electromagnetic interference device if the key words exist in the received speech information; the camera is used for recording image information and sending the image information to the analyzer; the image analyzer is used for receiving and analyzing whether a mobile communication device exists in the received image information and sending a second starting order to the electromagnetic interference device if the mobile communication device exists in the received image information; the electromagnetic interference device is started after receiving the first starting order and the second starting order. The remote monitoring system has the advantage of improving safety of the communication machine room.