Detection circuit applied to piezoresistive sensor

The invention discloses a detection circuit applied to a piezoresistive sensor. The detection circuit comprises a DC voltage stabilizing circuit, a voltage dividing circuit, a differential amplifyingcircuit and a zero setting circuit, which are sequentially connected, wherein the voltage dividing circuit comprises a first branch and a second bracket connected in parallel with each other, the irstbranch is formed by connecting a first reference resistor and a serial end in series, the second branch is formed by connecting a second reference resistor and a third reference resistor in series, circuits are respectively led out from the first reference resistor and the serial end and between the second reference resistor and the third reference resistor to access the differential amplifying circuit, a potential difference under zero input is eliminated by using the zero setting circuit, meanwhile further smoothing processing is performed on the detection current in combination with the DCvoltage stabilizing circui