The utility model relates to an insulating status monitoring device of buchholz relay contact, include: voltage input port, voltage sampling circuit, current input mouth, current detection circuit and treater, voltage sampling circuit samples to the voltage signal of voltage input port input, obtains the voltage sample value at buchholz relay contact both ends, and will the voltage sample value is transmitted to the treater, current detection circuit detects the current signal of current input mouth input, obtains the current detection value in buchholz relay contact return circuit, the state of insulation of treater real -time supervision buchholz relay contact. Utilize above -mentioned device, can in time discover the insulating reduction state of transformer buchholz relay contact, ensure power equipment's security.