The invention discloses an YSZ (yttria stabilized zirconia) blended potentiometric NH3 sensor with SnO2 as a sensitive electrode and a production method of the YSZ blended potentiometric NH3 sensor, and belongs to the technical field of gas sensors. The YSZ blended potentiometric NH3 sensor comprises an Al2O3 ceramic plate with a Pt heating electrode, a YSZ base plate, a Pt reference electrode with a strip structure, and the SnO2 sensitive electrode sequentially. A gold nanoparticle array structure is constructed in partial region of the upper surface of the YSZ base plate, and the SnO2 sensitive electrode is produced on the array structure. The Pt reference electrode is produced on the region, without the gold nanoparticle array structure, of the upper surface of the YSZ base plate. The lower surface of the YSZ base plate is bonded with the Al2O3 ceramic plate with the Pt heating electrode. YSZ serves as an ion conducting layer, the SnO2 with high electrochemistry catalytic activity serves as the sensitive electrode and is applied to the gold nanoparticle array structure, and the objective of improving sensitivity is achieved through introduction of the gold nanoparticle array structure.