The present work emphases the fabrication of a simple, solid-state, and cost-effective multifaceted device called a “self-charging photo power bank” based on an in situ-synthesized MgO2 NP-impregnated electroactive and high dielectric poly(vinylidene fluoride) thin film composite as its active material. Positioned under visible-light illumination of 110 mW/cm2 and in the absence of any sort of external bias, our optimized multilayered device can self-charge to a voltage of 1170 mV in just 24 s. An excitingly high energy density of 240 mW h/m2 and a remarkable charge density of 1350 C/m2 along with the excellent energy-retaining power of the device for a considerable period of time illustrate its potential as an efficient power bank. The device is used for 30 consecutive days to prove its commendable long-term cycling stability. Three blue, commercial LEDs and a digital table clock are successfully powered by our device. Our fabricated device portends an innovative approach for self-generation and simultaneous storage of electrical energy, making it an efficacious nascent aspirant in the realms of energy harvesting and storage, which can undoubtedly meet the energy necessities in the imminent future. In this work, MgO2 NPs has been prepared in-situ onto the PVDF matrix to obtain an electroactive and high dielectric composite thin film. A simple, low-cost, solid-state integrated device utilizing the synthesized composite film as the active material is fabricated named as “self-charging photo power bank” (SPPB). The device shows notably high values of energy densities, power densities, and areal capacitances. The device also holds an appreciable long-term recycling capability and has powered electronic gadgets like LEDs and digital table clock.