The invention relates to an integrated grounding piezoelectric fuze. The integrated grounding piezoelectric fuze comprises a signal processing circuit module, a signal output assembly, a shell, piezoelectric plates, a pre-tightening ring, an inertial mass block, insulating sheets, lead wire sheets, a positioning ring, lead wires, a pressing ring and an upper cover, wherein the signal processing circuit module is sealed inside the shell through an insulating damping material and is placed above the pressing ring; the pre-tightening ring is located between the pressing ring and the inertial mass block; two insulating sheets are arranged below the inertial mass block; the piezoelectric plates and the lead wire sheets are arranged between the two insulating sheets; signals of the piezoelectric plates are led out through the lead wire sheets connected with positive poles and negative poles of the piezoelectric plates; the signal processing circuit module and the lead wire sheets are connected through the lead wires; the signal output assembly is connected with the signal processing circuit module; and the signal processing circuit module comprises a comparator standard adjusting circuit, a comparing circuit, a silicon controlled rectifier Q1 and a standard source. The fuze has the characteristics of high reliability, fast response, small size, small weight, strong anti-impact capability and the like.