Solar-blind deep ultraviolet photodetectors demonstrate exceptional thermal stability and reliability, have been widely applied in areas such as ozone hole monitoring, flame detection, and space communications. However, the absorption rate of conventional solar-blind photodetectors is limited by material absorption, posing challenges for further improvement. This paper introduces a multilayer solar-blind photodetector structure that integrates a metasurface, a gallium oxide layer, a silicon oxide insulating layer, and a metal layer. Numerical simulations of its absorption performance reveal that by incorporating the metasurface structure, the structure achieves an absorption rate exceeding 92% across the entire solar-blind band of 200?280 nm. Additionally, the proposed structure exhibits polarization insensitivity and incident angle insensitivity, highlighting its strong practical application potential. This work serves as a valuable reference for advancing the performance and miniaturization of solar-blind photodetectors.