The utility model provides a cable pit monitoring and early warning equipment, utilize this monitoring and early warning equipment, can be to the smog in the cable pit, the gas strength, comprehensivereal -time supervision is carried out to information such as temperature and liquid level, make things convenient for the staff to manage and maintain the transformer substation, this equipment contains the box, be equipped with monitoring devices and RS485 communication interface on the box, monitoring devices contains pt100 temperature sensor at least, the bayonet level sensor of LDK, the gaseous consistency transmitter of HLPLANAR infrared ray, STP MW168 9v smoke transducer, processing unit and power module, RS485 communication interface is used for being connected the monitoring devices and the monitor terminal of control end to the enable signal who produces according to monitoring devices transmits exception data and early warning information to monitor terminal.