The utility model provides a fireproof door monitor. The device comprises a shell, a battery, a main control board, a door magnetic sensor and an antenna, the battery, the main control board and the door magnetic sensor are all installed in the shell. The battery is used for supplying power to the main control board and the door magnetic sensor; the door magnetic sensor is in signal connection with the main control board and can be used for receiving signals of the door magnetic sensor and judging the opening and closing state of the fireproof door according to the signals of the door magnetic sensor, the antenna is connected with the shell and can rotate relative to the shell, and the antenna is electrically connected with the main control board and can transmit the opening and closing state of the fireproof door to a remote server and/or a mobile terminal signal. The utility model provides a fireproof door monitor. Firefighters can know the opening and closing conditions of the fireproof door in time; the fireproof door which cannot be normally closed is checked and maintained in time, the situation that the fireproof door cannot isolate the fire when the fire occurs is avoided, real-time monitoring is provided for firefighters or related personnel, and the fire-fighting hidden danger caused by poor supervision can be prevented and avoided.