In order to systematically study the influence of configuration parameters of planar supercapacitors, planar supercapacitors with different interdigitated parameter characteristics were constructed by screen printing using activated carbon functional ink, with the corresponding electrochemical energy storage performance tested. The results showed, for the as-printed supercapacitor with the interdigital spacing of 1 mm and the interdigital number of 2, the specific energy reached 6.46 μWh/cm2 at a specific power of 0.1 mW/cm2. When the interdigital number increased to 16, the specific energy reached 2.03 μWh/cm2 at the same specific power while with better rate capacity. The geometric configuration parameters changed the effective electrode area, the electrolyte ion diffusion path, and the electrode resistance, thereby affecting the capacitive storage performance of those device, which can provide good reference for the configuration design and optimization of planar interdigital supercapacitors.