Insulation detection circuit

The utility model provides an insulation detection circuit in the technical field of electric automobiles. The insulation detection circuit comprises an MCU, a charging pile insulation detection circuit and an electric automobile insulation detection circuit. Each of the two detection circuits comprises a bridge circuit, a first gain controller, a second gain controller, a first in-phase amplifier, a second in-phase amplifier, an inverting amplifier and a first analog-to-digital converter; the first gain controller is connected with the MCU and the input end of the first in-phase amplifier; the first in-phase amplifier is connected with the bridge circuit and the first analog-to-digital converter; the second gain controller is connected with the MCU and the input end of the second in-phase amplifier; the second in-phase amplifier is connected with the bridge circuit and the inverting amplifier; one end of the first analog-to-digital converter is connected with the inverting amplifier, and the other end is con