Security testing system used for hybrid power vehicles and/or pure electric vehicles

The utility model provides a security testing system used for hybrid power vehicles and/or pure electric vehicles. The security testing system comprises a battery to be tested, a voltage reducing module, a switching module, a reference resistor R0 and a processing module; and the positive and negative poles of the battery to be tested are coupled to the processing module through the voltage reducing module; the positive pole of the battery to be tested and a vehicle body are coupled to the processing module through the voltage reducing module; the negative pole of the battery to be tested and the vehicle body are coupled to the processing module through the voltage reducing module; one end of the reference resistor is connected to the positive pole or negative pole of the battery to be tested through the switching module, and the other end of the reference resistor is connected to the vehicle body; and the processing module obtains an electrical isolation coefficient CEl, and generates signals indicating security or alarm signals according to the CEl and a security threshold value Cthr. With the security testing system used for the hybrid power vehicles and/or pure electric vehicles of the utility model, the security of operation can be guaranteed when high-voltage electrical tests are performed.