The invention provides a low-cost batch preparation method and application of a noble metal electrode array. The method comprises the following steps: mixing an aqueous solution of noble metal nanoparticles with an inorganic salt aqueous solution with a certain concentration in an isopyknic manner, and aggregating the noble metal nanoparticles to increase the particle size by utilizing a salting-out effect; pouring the mixed solution into a device fixed with a templated microporous filter membrane, and carrying out rapid deposition and room-temperature sintering on the aggregated noble metal nanoparticles in a blank area of the microporous filter membrane in a reduced-pressure filtration manner to form a patterned electrode array; and finally, carrying out washing and drying treatment, soas to produce the low-cost and high-conductivity noble metal electrode array in batches. The method utilizes a template filtering method and has the characteristics of simple preparation device and process, low preparation cost, high material utilization rate and the like. The prepared electrode array is easy to modify, controllable in thickness and good in uniformity and conductivity, and has a wide application prospect in the fields of electrochemical sensors, flexible electronic devices and the like.