To meet the development requirements of high-capacity fiber optic communication systems, this study employs an inverse design method to develop and implement a 0° perfect vertical grating coupler (PVGC) for multi-core fiber communication on a standard 220 nm silicon-on-insulator platform. The adjoint optimization-based inverse design approach effectively addresses multiparameter optimization challenges, demonstrating advantages of high efficiency, strong robustness, and excellent process compatibility for the optimized device. Analysis results show that the designed PVGC achieves a simulated coupling efficiency of -2.98 dB (with a 3 dB bandwidth of 50 nm) and a measured peak coupling efficiency of -3.89 dB (with a 3 dB bandwidth of 43 nm) at 1550 nm wavelength. Notably, this research has successfully developed a PVGC array for seven-core fibers, exhibiting an average peak coupling efficiency of -4.45 dB with channel uniformity errors controlled within 0.12 dB. These findings provide a high-performance and highly reliable photonic integrated solution for next-generation space-division multiplexing networks.