Ultra-high quality factor optical microcavities are key components for constructing various integrated photonic devices. Hybrid microcavities based on the photonic crystal microcavities provide a novel platform for realizing a strong light-matter interaction that possesses extensive application prospects in many fields, including cavity quantum electrodynamics, integrated single photon sources, and quantum computing. In this paper, we theoretically propose a novel photonic-plasmonic hybrid microcavity functioning in the visible light band based on the basic double heterostructure photonic crystal cavity with a gold bowtie plasmonic nanoantenna. Here, the structural parameters of the bowtie plasmonic nanostructures (i.e., gap, angle, length, thickness, and relative position) were adjusted to investigate the regulation effects on the quality factor Q, effective mode volume V, and figure of merit Q/V of the cavity using a three-dimensional finite-difference time-domain method. The simulation results reveal that the effective mode volume and the figure of merit of the hybrid microcavity are stable on the order of 10^-6 (λ/n)³ and 10⁸ (λ/n)^-3, respectively. Moreover, we achieved the highest Q/V value of 5.730689×10⁸ (λ/n)^-3, depicting a value much better than that of other microcavities.