In this study, a high-resolution spectrometer with a multi-fiber array input design is proposed to address the issue of weak Raman-scattered light detection energy caused by insufficient image plane utilization in conventional spectrometers that use a single optical fiber as the incident light source. The design optimizes the optical path by arranging seven incident optical fibers along the sagittal direction of the slit and incorporating a cylindrical lens for astigmatism correction. The system employs a 785 nm excitation wavelength and achieves a broad spectral coverage of 170~3200 cm^-1 across seven fields of view, achieving a full-band resolution of 7 cm^-1. Experimental results demonstrate that, compared to the 72% image plane utilization achieved with a single fiber configuration, the proposed design—featuring clustered fibers combined with a cylindrical lens significantly improves the image plane utilization to 97%, while maintaining uniform energy distribution across the image plane. This solution offers an effective approach for applications demanding high energy detection efficiency and intensity.