Underground operation vehicle-mounted liquid level monitoring and automatic liquid filling device

The utility model discloses a downhole operation vehicle-mounted liquid level monitoring and automatic liquid filling device which comprises a shaft and a connecting pipe, and the connecting pipe is connected with the shaft. The device further comprises a wellhead collector, a pneumatic diaphragm pump and a monitoring box. The wellhead collector is connected with the connecting pipe; the pneumatic diaphragm pump is connected with the connecting pipe; a PLC (Programmable Logic Controller) and an electromagnetic gas valve are arranged in the monitoring box; the wellhead collector is connected with the PLC through a signal control cable; the pneumatic diaphragm pump is connected with the electromagnetic gas valve through an anti-explosion gas pipe; the PLC is connected with a power source, and an air inlet of the electromagnetic air valve is connected with an air source. The device is simple and convenient to operate, and intelligent linkage of'dynamic monitoring-automatic liquid filling 'is realized; liquid lev