Detection circuit of NOx sensor chip

The utility model discloses a detection circuit of an NOx sensor chip. The detection circuit of the NOx sensor chip comprises a power source module, a trigger module, a main pump testing circuit, an auxiliary pump testing circuit and a metering pump testing circuit, wherein the main pump testing circuit, the auxiliary pump testing circuit and the metering pump testing circuit are connected in parallel; the power source module is respectively connected with the trigger module, the main pump testing circuit, the auxiliary pump testing circuit and the metering pump testing circuit; the control end of the trigger module is respectively connected with the main pump testing circuit, the auxiliary pump testing circuit and the metering pump testing circuit. The detection circuit of the NOx sensor chip is used for detecting the performance of the NOx sensor chip and can detect a main pump, an auxiliary pump and a metering pump at the same time; the detection circuit of the NOx sensor chip is combined with an oscillosc