Hybrid vehicle insulation monitoring device based on low-frequency signal

The utility model relates to a hybrid vehicle insulation monitoring device based on a low-frequency signal. The hybrid vehicle comprises a high voltage system and a chassis. An insulation resistor is connected between the high voltage system and the chassis. The device is characterized in that the insulation monitoring device comprises a hybrid power vehicle controller, an insulation monitor, a high voltage control cabinet, a power supply and a bus instrument; the hybrid power vehicle controller is connected with the insulation monitor, the high voltage control cabinet and the bus instrument respectively; the power supply is connected with the insulation monitor and the high voltage control cabinet respectively; the insulation monitor and the insulation resistor are connected and form a measuring loop. Compared to the prior art, by using the device of the utility model, there are the following advantages that vehicle usage safety is guaranteed; performance is reliable and so on.